<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:9bf23666-75ad-4022-a232-0910469e17c1,g:5735ce56-4db8-4149-9934-2cf8f05e33e6-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.rackspace.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="simple" xlink:href="rxt-20231231.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_865c0403-e380-4157-aa12-1d7ee4671b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2c6d3c77-c9d6-4626-95d1-22e9a583bc6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_865c0403-e380-4157-aa12-1d7ee4671b3e" xlink:to="loc_us-gaap_StatementTable_2c6d3c77-c9d6-4626-95d1-22e9a583bc6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9b080dca-9a4c-4777-8cdd-eac173159fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2c6d3c77-c9d6-4626-95d1-22e9a583bc6e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9b080dca-9a4c-4777-8cdd-eac173159fa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9b080dca-9a4c-4777-8cdd-eac173159fa7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9b080dca-9a4c-4777-8cdd-eac173159fa7" xlink:to="loc_us-gaap_EquityComponentDomain_9b080dca-9a4c-4777-8cdd-eac173159fa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9b080dca-9a4c-4777-8cdd-eac173159fa7" xlink:to="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_8d667401-b7a1-44e3-8c0d-8af1e6669089" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:to="loc_us-gaap_CommonStockMember_8d667401-b7a1-44e3-8c0d-8af1e6669089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_51d7ec2c-81ec-465a-b853-55be2a47b23d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_51d7ec2c-81ec-465a-b853-55be2a47b23d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ac1651a8-8cb6-4b09-95b8-0350caf35afb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ac1651a8-8cb6-4b09-95b8-0350caf35afb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_a39e25ec-f786-4e97-9fb7-97aa7b4bac6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:to="loc_us-gaap_RetainedEarningsMember_a39e25ec-f786-4e97-9fb7-97aa7b4bac6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_b176974c-3071-4a0b-a5e3-680cf214e032" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f2774893-56cb-4259-a8d2-763c1b5130ad" xlink:to="loc_us-gaap_TreasuryStockCommonMember_b176974c-3071-4a0b-a5e3-680cf214e032" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_865c0403-e380-4157-aa12-1d7ee4671b3e" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_e889ca4f-4e40-48e5-8dac-f6f56914121a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_e889ca4f-4e40-48e5-8dac-f6f56914121a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_24fe7463-cc3f-443f-bc48-69b298ff85ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockholdersEquity_24fe7463-cc3f-443f-bc48-69b298ff85ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_f1f40825-a21a-46e7-9596-3cd439265884" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_TreasuryStockCommonShares_f1f40825-a21a-46e7-9596-3cd439265884" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_2e861fb6-03b4-4bf2-becd-73acaa153323" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_2e861fb6-03b4-4bf2-becd-73acaa153323" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_70400be4-8d8e-4b26-9f0e-889d1f286534" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_70400be4-8d8e-4b26-9f0e-889d1f286534" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_32dfa3ab-ff8d-4ad8-aa83-384fd5b2fa3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_32dfa3ab-ff8d-4ad8-aa83-384fd5b2fa3f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_4b150684-3781-42e3-b8a2-7907a0a4455f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_4b150684-3781-42e3-b8a2-7907a0a4455f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_a3577270-39d3-4446-b88f-58c77a8cac75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_a3577270-39d3-4446-b88f-58c77a8cac75" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_8cde71c8-595c-4740-a3c2-49f85ddb755f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_8cde71c8-595c-4740-a3c2-49f85ddb755f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_60aa37ec-bb05-4323-8d8f-70b4ba680fb5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_NetIncomeLoss_60aa37ec-bb05-4323-8d8f-70b4ba680fb5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b3e3a88f-1d84-4797-a438-772f000d5ddd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b3e3a88f-1d84-4797-a438-772f000d5ddd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_09c92ec7-dc2d-470f-a637-4736ad0d2c5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_09c92ec7-dc2d-470f-a637-4736ad0d2c5e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_38526103-8584-4b3b-a3ce-9106d9bad895" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_3882f320-21c2-4b62-86f6-00bfd9646f38" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_38526103-8584-4b3b-a3ce-9106d9bad895" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_499c9fb4-7e13-4f0f-a5f4-97ed6c7a532a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_95bcf42c-7c47-44bb-a724-666d40ab10c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_51c494df-8a68-4b18-902d-5c68e04b6a07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSaleofStockandLiquidityOverviewDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSaleofStockandLiquidityOverviewDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSaleofStockandLiquidityOverviewDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9a51ea41-635b-4c4c-88a8-84c14c590f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a7ed0ef4-38ca-47d0-88ef-a4e2da98f525" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9a51ea41-635b-4c4c-88a8-84c14c590f2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_JustAnalyticsPteLtdMember_913bbcc4-fc9a-46d3-bac2-ee1cb2e8bb44" xlink:href="rxt-20231231.xsd#rxt_JustAnalyticsPteLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9a51ea41-635b-4c4c-88a8-84c14c590f2a" xlink:to="loc_rxt_JustAnalyticsPteLtdMember_913bbcc4-fc9a-46d3-bac2-ee1cb2e8bb44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:to="loc_us-gaap_CreditFacilityAxis_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c" xlink:to="loc_us-gaap_CreditFacilityDomain_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ed3459a8-43f9-40e2-8b90-4ccead5a2284" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_f2d5e83e-7af2-4cd0-bab8-9aeb80f1ce2c" xlink:to="loc_us-gaap_CreditFacilityDomain_ed3459a8-43f9-40e2-8b90-4ccead5a2284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_dd6de7c9-c425-4bd3-9277-4ebcfa34ac01" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ed3459a8-43f9-40e2-8b90-4ccead5a2284" xlink:to="loc_us-gaap_SecuredDebtMember_dd6de7c9-c425-4bd3-9277-4ebcfa34ac01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_cb5efee1-e11d-4725-92e7-a0f739f5edca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ed3459a8-43f9-40e2-8b90-4ccead5a2284" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_cb5efee1-e11d-4725-92e7-a0f739f5edca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_63bd4ce6-662a-4470-9427-38a672907690" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:to="loc_us-gaap_DebtInstrumentAxis_63bd4ce6-662a-4470-9427-38a672907690" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_63bd4ce6-662a-4470-9427-38a672907690_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_63bd4ce6-662a-4470-9427-38a672907690" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_63bd4ce6-662a-4470-9427-38a672907690_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b74e7891-a717-489e-9096-083d9e6fcf19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_63bd4ce6-662a-4470-9427-38a672907690" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b74e7891-a717-489e-9096-083d9e6fcf19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CurrentTermLoanFacilityMember_92d53df3-f6f3-472a-bf8c-7edd261fb9bc" xlink:href="rxt-20231231.xsd#rxt_CurrentTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b74e7891-a717-489e-9096-083d9e6fcf19" xlink:to="loc_rxt_CurrentTermLoanFacilityMember_92d53df3-f6f3-472a-bf8c-7edd261fb9bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SeniorNotes5375Due2028Member_99c3f6a9-7df0-44fb-9a47-483bdf7f1d3b" xlink:href="rxt-20231231.xsd#rxt_SeniorNotes5375Due2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b74e7891-a717-489e-9096-083d9e6fcf19" xlink:to="loc_rxt_SeniorNotes5375Due2028Member_99c3f6a9-7df0-44fb-9a47-483bdf7f1d3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A350SeniorSecuredNotesDue2028Member_5af937b9-e8b1-4748-8dd4-8a495f917292" xlink:href="rxt-20231231.xsd#rxt_A350SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_b74e7891-a717-489e-9096-083d9e6fcf19" xlink:to="loc_rxt_A350SeniorSecuredNotesDue2028Member_5af937b9-e8b1-4748-8dd4-8a495f917292" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_049829ef-257c-4ecf-a457-81356ae40538" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_049829ef-257c-4ecf-a457-81356ae40538" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_049829ef-257c-4ecf-a457-81356ae40538_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_049829ef-257c-4ecf-a457-81356ae40538" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_049829ef-257c-4ecf-a457-81356ae40538_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_de8d7e36-c37d-406b-858b-9bc71b7fc360" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_049829ef-257c-4ecf-a457-81356ae40538" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_de8d7e36-c37d-406b-858b-9bc71b7fc360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_1813b18d-ecde-40b7-882f-b12a36c1acf8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_de8d7e36-c37d-406b-858b-9bc71b7fc360" xlink:to="loc_us-gaap_LineOfCreditMember_1813b18d-ecde-40b7-882f-b12a36c1acf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_186604d8-df48-4d79-98d7-f4295e7428f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_de8d7e36-c37d-406b-858b-9bc71b7fc360" xlink:to="loc_us-gaap_SeniorNotesMember_186604d8-df48-4d79-98d7-f4295e7428f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_eda7ef1c-5b1f-4192-a107-bf66ae15733d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSubsidiaryOrEquityMethodInvesteeTable_a0421fbe-be0c-4455-86f8-89e6f1c5aa1e" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_eda7ef1c-5b1f-4192-a107-bf66ae15733d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_eda7ef1c-5b1f-4192-a107-bf66ae15733d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_eda7ef1c-5b1f-4192-a107-bf66ae15733d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_eda7ef1c-5b1f-4192-a107-bf66ae15733d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_e02dc2e7-69b6-4a13-9851-95d42874eb65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_eda7ef1c-5b1f-4192-a107-bf66ae15733d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_e02dc2e7-69b6-4a13-9851-95d42874eb65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_d1f21f90-6b23-4a51-9539-188fa2da3a03" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_e02dc2e7-69b6-4a13-9851-95d42874eb65" xlink:to="loc_us-gaap_SubsequentEventMember_d1f21f90-6b23-4a51-9539-188fa2da3a03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_a40aaeaa-23f9-41ab-a760-ebaaaaeb7621" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_a40aaeaa-23f9-41ab-a760-ebaaaaeb7621" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4ac830d3-3009-4b48-ac7c-49c77412df9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4ac830d3-3009-4b48-ac7c-49c77412df9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BusinessAcquisitionPeriodOfRecognitionOfCompensationCosts_d57ccedf-50ac-4a52-854b-72ceccc5bd60" xlink:href="rxt-20231231.xsd#rxt_BusinessAcquisitionPeriodOfRecognitionOfCompensationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_rxt_BusinessAcquisitionPeriodOfRecognitionOfCompensationCosts_d57ccedf-50ac-4a52-854b-72ceccc5bd60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NumberOfUnitsInABusinessOperatingModel_85a0c282-c1b5-45a8-82c2-a14611d9d093" xlink:href="rxt-20231231.xsd#rxt_NumberOfUnitsInABusinessOperatingModel"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_rxt_NumberOfUnitsInABusinessOperatingModel_85a0c282-c1b5-45a8-82c2-a14611d9d093" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_b1b3acbf-f321-4ce0-af9b-06ac0905ed40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_NumberOfReportableSegments_b1b3acbf-f321-4ce0-af9b-06ac0905ed40" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_5d5d4c3a-d23b-4a46-86b3-dc9a5f824cd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_NumberOfOperatingSegments_5d5d4c3a-d23b-4a46-86b3-dc9a5f824cd1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_756f0f9a-fc7f-45f0-9d8e-4f7633367651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_756f0f9a-fc7f-45f0-9d8e-4f7633367651" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a35d99fc-782a-44cc-a121-8b6edb24b824" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a35d99fc-782a-44cc-a121-8b6edb24b824" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c4a49851-b7b2-47a5-9f17-4aeb90ee2926" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c4a49851-b7b2-47a5-9f17-4aeb90ee2926" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_fe326f6e-6663-4dc8-9830-b6478482d187" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_LineOfCredit_fe326f6e-6663-4dc8-9830-b6478482d187" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0cb72d53-f3d7-40ec-af45-9077a413c820" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems_1ee11048-106a-4357-8668-feb11ecb30eb" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0cb72d53-f3d7-40ec-af45-9077a413c820" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSubsequentEventsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesSubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_4b2651ad-628c-49b0-8ba1-7503399017f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:to="loc_us-gaap_DebtInstrumentAxis_4b2651ad-628c-49b0-8ba1-7503399017f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4b2651ad-628c-49b0-8ba1-7503399017f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_4b2651ad-628c-49b0-8ba1-7503399017f9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4b2651ad-628c-49b0-8ba1-7503399017f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_4b2651ad-628c-49b0-8ba1-7503399017f9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A350SeniorSecuredNotesDue2028Member_cdd956ac-8bae-4a20-83c1-ffb5e3cc2464" xlink:href="rxt-20231231.xsd#rxt_A350SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_A350SeniorSecuredNotesDue2028Member_cdd956ac-8bae-4a20-83c1-ffb5e3cc2464" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CurrentTermLoanFacilityMember_9a860593-171f-452d-ade6-f798d2cde745" xlink:href="rxt-20231231.xsd#rxt_CurrentTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_CurrentTermLoanFacilityMember_9a860593-171f-452d-ade6-f798d2cde745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NewFirstLienSecondOutSeniorSecuredTermLoanFacilityFLSOMember_5e581ce5-b74d-4bdc-ab4f-92fc625b2b1e" xlink:href="rxt-20231231.xsd#rxt_NewFirstLienSecondOutSeniorSecuredTermLoanFacilityFLSOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_NewFirstLienSecondOutSeniorSecuredTermLoanFacilityFLSOMember_5e581ce5-b74d-4bdc-ab4f-92fc625b2b1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NewFirstLienFirstOutSeniorSecuredTermLoansFLFOMember_e951b19e-15a0-4b65-b437-fe2834d093b4" xlink:href="rxt-20231231.xsd#rxt_NewFirstLienFirstOutSeniorSecuredTermLoansFLFOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_NewFirstLienFirstOutSeniorSecuredTermLoansFLFOMember_e951b19e-15a0-4b65-b437-fe2834d093b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SeniorNotes5375Due2028Member_7172a9c4-3133-4425-b180-c23c1833dbc3" xlink:href="rxt-20231231.xsd#rxt_SeniorNotes5375Due2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_SeniorNotes5375Due2028Member_7172a9c4-3133-4425-b180-c23c1833dbc3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NewRevolvingCreditFacilityMember_4e0319cb-8c52-4395-8f8f-343dc59c3c26" xlink:href="rxt-20231231.xsd#rxt_NewRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_117c0724-630d-47d8-83d4-f9464bfb90da" xlink:to="loc_rxt_NewRevolvingCreditFacilityMember_4e0319cb-8c52-4395-8f8f-343dc59c3c26" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_fb353b81-822d-4dc8-b559-60fb436ac2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_fb353b81-822d-4dc8-b559-60fb436ac2b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fb353b81-822d-4dc8-b559-60fb436ac2b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fb353b81-822d-4dc8-b559-60fb436ac2b5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fb353b81-822d-4dc8-b559-60fb436ac2b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6dd7f115-b28e-4b3e-8383-fde3bf1263e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_fb353b81-822d-4dc8-b559-60fb436ac2b5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6dd7f115-b28e-4b3e-8383-fde3bf1263e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_023a5e6d-bf1f-4f41-9b20-6e624b36512f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6dd7f115-b28e-4b3e-8383-fde3bf1263e2" xlink:to="loc_us-gaap_SeniorNotesMember_023a5e6d-bf1f-4f41-9b20-6e624b36512f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_22af4117-0392-466f-9063-eb21e8a920be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6dd7f115-b28e-4b3e-8383-fde3bf1263e2" xlink:to="loc_us-gaap_SecuredDebtMember_22af4117-0392-466f-9063-eb21e8a920be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_f1e9baee-ebbe-4e70-a128-d49ac6b24b2e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6dd7f115-b28e-4b3e-8383-fde3bf1263e2" xlink:to="loc_us-gaap_LineOfCreditMember_f1e9baee-ebbe-4e70-a128-d49ac6b24b2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_03ed2b90-4224-4046-9467-02f856082a31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_03ed2b90-4224-4046-9467-02f856082a31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_03ed2b90-4224-4046-9467-02f856082a31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_03ed2b90-4224-4046-9467-02f856082a31" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_03ed2b90-4224-4046-9467-02f856082a31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_89064c8a-44e3-4d0a-a461-9f7c02c19510" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_03ed2b90-4224-4046-9467-02f856082a31" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_89064c8a-44e3-4d0a-a461-9f7c02c19510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_a9c24b3a-c178-4ba5-b431-1e419660b200" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_89064c8a-44e3-4d0a-a461-9f7c02c19510" xlink:to="loc_us-gaap_SubsequentEventMember_a9c24b3a-c178-4ba5-b431-1e419660b200" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:to="loc_srt_StatementScenarioAxis_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de" xlink:to="loc_srt_ScenarioUnspecifiedDomain_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_cf1f2686-b6e9-4181-b01b-5aac4aa06a91" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_d70d1b2f-0007-4023-a7e0-5f9d3c40d9de" xlink:to="loc_srt_ScenarioUnspecifiedDomain_cf1f2686-b6e9-4181-b01b-5aac4aa06a91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_36ca159f-8579-40f4-9648-b9b919bfd3be" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_cf1f2686-b6e9-4181-b01b-5aac4aa06a91" xlink:to="loc_srt_ScenarioForecastMember_36ca159f-8579-40f4-9648-b9b919bfd3be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f198308a-4095-4c8c-a588-4e0e6688f9e2" xlink:to="loc_us-gaap_CreditFacilityAxis_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb" xlink:to="loc_us-gaap_CreditFacilityDomain_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_fd51105f-7343-4126-84a9-81be3ae6c3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_50030b8f-f6cd-40c4-b98b-5ad9b01b6beb" xlink:to="loc_us-gaap_CreditFacilityDomain_fd51105f-7343-4126-84a9-81be3ae6c3fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a7d2dab9-1db7-4ded-91d1-09e1120fbedb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_fd51105f-7343-4126-84a9-81be3ae6c3fd" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a7d2dab9-1db7-4ded-91d1-09e1120fbedb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_23070869-24da-4154-a07c-18b868368581" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_23070869-24da-4154-a07c-18b868368581" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentPercentOfTotalDebt_57003898-e69b-4fa8-9b83-0bae81765c0e" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentPercentOfTotalDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_rxt_DebtInstrumentPercentOfTotalDebt_57003898-e69b-4fa8-9b83-0bae81765c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_487cd473-36d1-4588-bfde-516b3576c16c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_487cd473-36d1-4588-bfde-516b3576c16c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_17e4e963-4865-456d-a733-efb005934a47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_17e4e963-4865-456d-a733-efb005934a47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentAmountOfDebtWithExtendedMaturity_e027ff5d-d474-4b6c-9b31-6a1ae73b9cb0" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentAmountOfDebtWithExtendedMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_rxt_DebtInstrumentAmountOfDebtWithExtendedMaturity_e027ff5d-d474-4b6c-9b31-6a1ae73b9cb0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_48a3c667-4c48-41c2-9c4d-837941c13bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_48a3c667-4c48-41c2-9c4d-837941c13bb0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_94b75324-47bf-4a60-9889-d1e33bb57592" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_60dd8632-e812-44fd-a42b-5356e549d84b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_94b75324-47bf-4a60-9889-d1e33bb57592" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesCashCashEquivalentsRestrictedCashandPropertyEquipmentandSoftwareandDefiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesCashCashEquivalentsRestrictedCashandPropertyEquipmentandSoftwareandDefiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesCashCashEquivalentsRestrictedCashandPropertyEquipmentandSoftwareandDefiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b0666b5c-0828-40fd-8cd8-8a5a06edd723" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_122e3733-24aa-4911-9220-3acf59828b5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b0666b5c-0828-40fd-8cd8-8a5a06edd723" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_122e3733-24aa-4911-9220-3acf59828b5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_21037342-a0a4-475b-9141-73ea3a2761b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_122e3733-24aa-4911-9220-3acf59828b5a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_21037342-a0a4-475b-9141-73ea3a2761b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_21037342-a0a4-475b-9141-73ea3a2761b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21037342-a0a4-475b-9141-73ea3a2761b5" xlink:to="loc_us-gaap_SegmentDomain_21037342-a0a4-475b-9141-73ea3a2761b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_434a1976-758d-45e0-9b2b-3b11f4de66b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_21037342-a0a4-475b-9141-73ea3a2761b5" xlink:to="loc_us-gaap_SegmentDomain_434a1976-758d-45e0-9b2b-3b11f4de66b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OpenStackPublicCloudSegmentMember_c1b8346a-89d9-4bc0-a069-fdd24cb66b0d" xlink:href="rxt-20231231.xsd#rxt_OpenStackPublicCloudSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_434a1976-758d-45e0-9b2b-3b11f4de66b4" xlink:to="loc_rxt_OpenStackPublicCloudSegmentMember_c1b8346a-89d9-4bc0-a069-fdd24cb66b0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_fde4dafb-a667-4530-8c9f-ef5016b05f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b0666b5c-0828-40fd-8cd8-8a5a06edd723" xlink:to="loc_us-gaap_RestrictedCash_fde4dafb-a667-4530-8c9f-ef5016b05f5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_24a2fcdb-f8d4-421d-9708-502d26871456" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b0666b5c-0828-40fd-8cd8-8a5a06edd723" xlink:to="loc_us-gaap_InterestCostsCapitalized_24a2fcdb-f8d4-421d-9708-502d26871456" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ImpairmentOfLongLivedAssetsHeldForSaleAndIntangibleAssets_d8a807b5-6a8b-499c-9307-a91929671e81" xlink:href="rxt-20231231.xsd#rxt_ImpairmentOfLongLivedAssetsHeldForSaleAndIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b0666b5c-0828-40fd-8cd8-8a5a06edd723" xlink:to="loc_rxt_ImpairmentOfLongLivedAssetsHeldForSaleAndIntangibleAssets_d8a807b5-6a8b-499c-9307-a91929671e81" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesEstimatedUsefulLivesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesEstimatedUsefulLivesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesEstimatedUsefulLivesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0635b030-5c86-4ffa-9d14-c0b22a1fdf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2c587c23-1d18-45bc-8c50-ea14682486b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0635b030-5c86-4ffa-9d14-c0b22a1fdf1d" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2c587c23-1d18-45bc-8c50-ea14682486b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_444e7812-f7b0-483f-a8c8-3912d7b4df86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2c587c23-1d18-45bc-8c50-ea14682486b4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_444e7812-f7b0-483f-a8c8-3912d7b4df86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_444e7812-f7b0-483f-a8c8-3912d7b4df86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_444e7812-f7b0-483f-a8c8-3912d7b4df86" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_444e7812-f7b0-483f-a8c8-3912d7b4df86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_444e7812-f7b0-483f-a8c8-3912d7b4df86" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ComputerAndEquipmentMember_e0f53bcc-7a4c-47e5-9b82-1efdabaac336" xlink:href="rxt-20231231.xsd#rxt_ComputerAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:to="loc_rxt_ComputerAndEquipmentMember_e0f53bcc-7a4c-47e5-9b82-1efdabaac336" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_e82aa0cb-6170-4710-b614-2ff622c69a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_e82aa0cb-6170-4710-b614-2ff622c69a7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_e7d38ab8-f010-454f-96b6-ef9fa2efd424" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_e7d38ab8-f010-454f-96b6-ef9fa2efd424" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BuildingsAndLeaseholdImprovementsMember_0e1417ad-347f-4390-a05c-61144cec84d3" xlink:href="rxt-20231231.xsd#rxt_BuildingsAndLeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f07930bc-49bc-4e01-8002-ac3950002b82" xlink:to="loc_rxt_BuildingsAndLeaseholdImprovementsMember_0e1417ad-347f-4390-a05c-61144cec84d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c0cf978f-2d39-4163-b7c7-57585df96f14" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2c587c23-1d18-45bc-8c50-ea14682486b4" xlink:to="loc_srt_RangeAxis_c0cf978f-2d39-4163-b7c7-57585df96f14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c0cf978f-2d39-4163-b7c7-57585df96f14_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c0cf978f-2d39-4163-b7c7-57585df96f14" xlink:to="loc_srt_RangeMember_c0cf978f-2d39-4163-b7c7-57585df96f14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ec8a188f-15b4-49d0-9888-a0fe052d49e1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c0cf978f-2d39-4163-b7c7-57585df96f14" xlink:to="loc_srt_RangeMember_ec8a188f-15b4-49d0-9888-a0fe052d49e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_7e090c09-a94b-4efb-8da4-1fef86ed9cc1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ec8a188f-15b4-49d0-9888-a0fe052d49e1" xlink:to="loc_srt_MinimumMember_7e090c09-a94b-4efb-8da4-1fef86ed9cc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_07a15537-3a9f-4cc6-956c-e49a8c6a8219" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ec8a188f-15b4-49d0-9888-a0fe052d49e1" xlink:to="loc_srt_MaximumMember_07a15537-3a9f-4cc6-956c-e49a8c6a8219" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_72dba9d7-eb65-4ad9-83b4-a76787c48ea8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0635b030-5c86-4ffa-9d14-c0b22a1fdf1d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_72dba9d7-eb65-4ad9-83b4-a76787c48ea8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesGoodwillandIntangibleAssetsandInvestmentsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesGoodwillandIntangibleAssetsandInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesGoodwillandIntangibleAssetsandInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1cc231a2-1c1f-4af2-9aac-50b47ed3cd6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1cc231a2-1c1f-4af2-9aac-50b47ed3cd6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bcacc1e3-cf7c-40ce-a16e-733666d9da13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1cc231a2-1c1f-4af2-9aac-50b47ed3cd6b" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bcacc1e3-cf7c-40ce-a16e-733666d9da13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_bcacc1e3-cf7c-40ce-a16e-733666d9da13_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bcacc1e3-cf7c-40ce-a16e-733666d9da13" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_bcacc1e3-cf7c-40ce-a16e-733666d9da13_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_22a4082b-2995-4a0b-86a0-da220d6babe1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bcacc1e3-cf7c-40ce-a16e-733666d9da13" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_22a4082b-2995-4a0b-86a0-da220d6babe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_8024078e-dd31-4a92-b40f-e072e23d22b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_22a4082b-2995-4a0b-86a0-da220d6babe1" xlink:to="loc_us-gaap_TradeNamesMember_8024078e-dd31-4a92-b40f-e072e23d22b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_30005a2d-5bd3-428a-ae06-6cc0a3876539" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1cc231a2-1c1f-4af2-9aac-50b47ed3cd6b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_30005a2d-5bd3-428a-ae06-6cc0a3876539" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_30005a2d-5bd3-428a-ae06-6cc0a3876539_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_30005a2d-5bd3-428a-ae06-6cc0a3876539" xlink:to="loc_us-gaap_SegmentDomain_30005a2d-5bd3-428a-ae06-6cc0a3876539_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1db9e913-e11f-437f-a730-e1c91483e92e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_30005a2d-5bd3-428a-ae06-6cc0a3876539" xlink:to="loc_us-gaap_SegmentDomain_1db9e913-e11f-437f-a730-e1c91483e92e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AppsCrossPlatformSegmentMember_0bdf46ea-7253-4f8c-bfaf-b2e2df77ca48" xlink:href="rxt-20231231.xsd#rxt_AppsCrossPlatformSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1db9e913-e11f-437f-a730-e1c91483e92e" xlink:to="loc_rxt_AppsCrossPlatformSegmentMember_0bdf46ea-7253-4f8c-bfaf-b2e2df77ca48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_f701c573-40b1-4bf4-8885-e0b017b4c55e" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1db9e913-e11f-437f-a730-e1c91483e92e" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_f701c573-40b1-4bf4-8885-e0b017b4c55e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_MultiCloudServicesSegmentMember_7948b9ec-f769-4143-8a71-6fd427de8fbc" xlink:href="rxt-20231231.xsd#rxt_MultiCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1db9e913-e11f-437f-a730-e1c91483e92e" xlink:to="loc_rxt_MultiCloudServicesSegmentMember_7948b9ec-f769-4143-8a71-6fd427de8fbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NumberOfUnitsInABusinessOperatingModel_daa1c45e-3999-416a-a131-a160eba8fbc4" xlink:href="rxt-20231231.xsd#rxt_NumberOfUnitsInABusinessOperatingModel"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_rxt_NumberOfUnitsInABusinessOperatingModel_daa1c45e-3999-416a-a131-a160eba8fbc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8f742787-9dc3-4d0e-b031-4dc86de06c41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_8f742787-9dc3-4d0e-b031-4dc86de06c41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportingUnits_7bfed648-d313-456b-89f7-179d854a524d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_us-gaap_NumberOfReportingUnits_7bfed648-d313-456b-89f7-179d854a524d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_f40d21de-6119-4e37-8e65-509a2739aeae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_f40d21de-6119-4e37-8e65-509a2739aeae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_d5e9db0d-f755-4989-8482-524b62afeb38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_3e164430-3ee0-4829-b9fe-abb40986cd09" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_d5e9db0d-f755-4989-8482-524b62afeb38" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesLeasesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_accff32b-69e1-4d28-bb22-a14fd5b5cd04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_d26d403f-0447-4e5e-a867-1ff6fd978010" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_accff32b-69e1-4d28-bb22-a14fd5b5cd04" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_d26d403f-0447-4e5e-a867-1ff6fd978010" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_88ea8655-a042-4a71-b92f-f3c22ba1768c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_d26d403f-0447-4e5e-a867-1ff6fd978010" xlink:to="loc_srt_RangeAxis_88ea8655-a042-4a71-b92f-f3c22ba1768c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_88ea8655-a042-4a71-b92f-f3c22ba1768c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_88ea8655-a042-4a71-b92f-f3c22ba1768c" xlink:to="loc_srt_RangeMember_88ea8655-a042-4a71-b92f-f3c22ba1768c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d0692bbf-342b-4fb4-ac2c-7cc3a3ee95a5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_88ea8655-a042-4a71-b92f-f3c22ba1768c" xlink:to="loc_srt_RangeMember_d0692bbf-342b-4fb4-ac2c-7cc3a3ee95a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_476676d0-f05c-4ff2-8f61-9d2370b9d34e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d0692bbf-342b-4fb4-ac2c-7cc3a3ee95a5" xlink:to="loc_srt_MinimumMember_476676d0-f05c-4ff2-8f61-9d2370b9d34e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6852d1ff-4396-4bd9-a0f0-721547596c35" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d0692bbf-342b-4fb4-ac2c-7cc3a3ee95a5" xlink:to="loc_srt_MaximumMember_6852d1ff-4396-4bd9-a0f0-721547596c35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_d26d403f-0447-4e5e-a867-1ff6fd978010" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8dc4d4a0-d877-4f1e-ae38-49690468081f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7a03a6cd-cfb2-4108-bf02-bfb2c73455d3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8dc4d4a0-d877-4f1e-ae38-49690468081f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DataCentersMember_dee06699-475d-40eb-ab8e-820497cea0a6" xlink:href="rxt-20231231.xsd#rxt_DataCentersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8dc4d4a0-d877-4f1e-ae38-49690468081f" xlink:to="loc_rxt_DataCentersMember_dee06699-475d-40eb-ab8e-820497cea0a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_7e484406-7116-4402-a748-a98f8d80fb16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8dc4d4a0-d877-4f1e-ae38-49690468081f" xlink:to="loc_us-gaap_EquipmentMember_7e484406-7116-4402-a748-a98f8d80fb16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OfficeSpaceMember_6cc328ac-a6eb-41cd-8dd4-2286473629bc" xlink:href="rxt-20231231.xsd#rxt_OfficeSpaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8dc4d4a0-d877-4f1e-ae38-49690468081f" xlink:to="loc_rxt_OfficeSpaceMember_6cc328ac-a6eb-41cd-8dd4-2286473629bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_785a72b6-c21c-4cec-8cb8-5846a01782c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_accff32b-69e1-4d28-bb22-a14fd5b5cd04" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_785a72b6-c21c-4cec-8cb8-5846a01782c2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesRevenueDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CompanyOverviewBasisofPresentationandSummaryofSignificantAccountingPoliciesRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2e45ba65-f03a-4207-833a-43a347f9375a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingRevenueReconcilingItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_4def2907-2d43-4d46-b7b4-b5f37d9a4ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2e45ba65-f03a-4207-833a-43a347f9375a" xlink:to="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_4def2907-2d43-4d46-b7b4-b5f37d9a4ec9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ba97d97d-4b39-466c-bc8a-a9c63f720656" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_4def2907-2d43-4d46-b7b4-b5f37d9a4ec9" xlink:to="loc_srt_ProductOrServiceAxis_ba97d97d-4b39-466c-bc8a-a9c63f720656" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ba97d97d-4b39-466c-bc8a-a9c63f720656_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ba97d97d-4b39-466c-bc8a-a9c63f720656" xlink:to="loc_srt_ProductsAndServicesDomain_ba97d97d-4b39-466c-bc8a-a9c63f720656_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9b62c497-fe68-4b1a-8fba-be5a7ded08a2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ba97d97d-4b39-466c-bc8a-a9c63f720656" xlink:to="loc_srt_ProductsAndServicesDomain_9b62c497-fe68-4b1a-8fba-be5a7ded08a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_b9ad4c05-477d-475e-a784-7cc196d182a6" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9b62c497-fe68-4b1a-8fba-be5a7ded08a2" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_b9ad4c05-477d-475e-a784-7cc196d182a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_eb85a221-ddd0-4fe7-b925-9d9d5f449485" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_4def2907-2d43-4d46-b7b4-b5f37d9a4ec9" xlink:to="loc_srt_RangeAxis_eb85a221-ddd0-4fe7-b925-9d9d5f449485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_eb85a221-ddd0-4fe7-b925-9d9d5f449485_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_eb85a221-ddd0-4fe7-b925-9d9d5f449485" xlink:to="loc_srt_RangeMember_eb85a221-ddd0-4fe7-b925-9d9d5f449485_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_536f878d-9f3a-4491-81d0-3a1dd7b50d01" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_eb85a221-ddd0-4fe7-b925-9d9d5f449485" xlink:to="loc_srt_RangeMember_536f878d-9f3a-4491-81d0-3a1dd7b50d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_19486a3d-459d-415d-bfe9-7bad4b8f7aea" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_536f878d-9f3a-4491-81d0-3a1dd7b50d01" xlink:to="loc_srt_MinimumMember_19486a3d-459d-415d-bfe9-7bad4b8f7aea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b71edd36-3904-4518-8a64-d1f8cd8e88ba" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_536f878d-9f3a-4491-81d0-3a1dd7b50d01" xlink:to="loc_srt_MaximumMember_b71edd36-3904-4518-8a64-d1f8cd8e88ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_RevenueRecognitionCustomerContractPeriod_8f62e814-ac53-413b-a906-7f7636234186" xlink:href="rxt-20231231.xsd#rxt_RevenueRecognitionCustomerContractPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2e45ba65-f03a-4207-833a-43a347f9375a" xlink:to="loc_rxt_RevenueRecognitionCustomerContractPeriod_8f62e814-ac53-413b-a906-7f7636234186" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ExpectedServiceDeliveryPeriod_fc9329b8-40ac-4b19-949d-e32429752e8c" xlink:href="rxt-20231231.xsd#rxt_ExpectedServiceDeliveryPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_2e45ba65-f03a-4207-833a-43a347f9375a" xlink:to="loc_rxt_ExpectedServiceDeliveryPeriod_fc9329b8-40ac-4b19-949d-e32429752e8c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CustomerContractsNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CustomerContractsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CustomerContractsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostTable_0da7ac56-b74d-49c2-a295-515b4a01648c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_CapitalizedContractCostTable_0da7ac56-b74d-49c2-a295-515b4a01648c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_c25d2060-78fc-4b70-a0a1-ddae6c372472" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_0da7ac56-b74d-49c2-a295-515b4a01648c" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_c25d2060-78fc-4b70-a0a1-ddae6c372472" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_c25d2060-78fc-4b70-a0a1-ddae6c372472_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_c25d2060-78fc-4b70-a0a1-ddae6c372472" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_c25d2060-78fc-4b70-a0a1-ddae6c372472_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_ccedb91c-baef-48ff-8f7a-076b76cb8f45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_c25d2060-78fc-4b70-a0a1-ddae6c372472" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_ccedb91c-baef-48ff-8f7a-076b76cb8f45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CostToObtainAContractMember_d1701926-fb49-4241-95d7-1beff69bc82e" xlink:href="rxt-20231231.xsd#rxt_CostToObtainAContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_ccedb91c-baef-48ff-8f7a-076b76cb8f45" xlink:to="loc_rxt_CostToObtainAContractMember_d1701926-fb49-4241-95d7-1beff69bc82e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CostToFulfillAContractMember_6021caa2-e458-4373-9528-e44a0bea041c" xlink:href="rxt-20231231.xsd#rxt_CostToFulfillAContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_ccedb91c-baef-48ff-8f7a-076b76cb8f45" xlink:to="loc_rxt_CostToFulfillAContractMember_6021caa2-e458-4373-9528-e44a0bea041c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_da00218c-daef-4669-939e-ee32fff47b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_0da7ac56-b74d-49c2-a295-515b4a01648c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_da00218c-daef-4669-939e-ee32fff47b9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_da00218c-daef-4669-939e-ee32fff47b9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_da00218c-daef-4669-939e-ee32fff47b9d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_da00218c-daef-4669-939e-ee32fff47b9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_53abd4ec-fe4e-4dea-867f-72b366417cce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_da00218c-daef-4669-939e-ee32fff47b9d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_53abd4ec-fe4e-4dea-867f-72b366417cce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ConvertibleNoteReceivableMember_130b718b-40a4-492a-ac87-42d338fd7edf" xlink:href="rxt-20231231.xsd#rxt_ConvertibleNoteReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_53abd4ec-fe4e-4dea-867f-72b366417cce" xlink:to="loc_rxt_ConvertibleNoteReceivableMember_130b718b-40a4-492a-ac87-42d338fd7edf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_5c923ba5-a14b-43d9-b354-1590609bd500" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_0da7ac56-b74d-49c2-a295-515b4a01648c" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_5c923ba5-a14b-43d9-b354-1590609bd500" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_5c923ba5-a14b-43d9-b354-1590609bd500_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_5c923ba5-a14b-43d9-b354-1590609bd500" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_5c923ba5-a14b-43d9-b354-1590609bd500_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_d4cacdf5-fd1d-4eae-b1c7-4cdb7827bbf5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_5c923ba5-a14b-43d9-b354-1590609bd500" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_d4cacdf5-fd1d-4eae-b1c7-4cdb7827bbf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_713275e1-1335-485e-9329-b229d1a80479" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_d4cacdf5-fd1d-4eae-b1c7-4cdb7827bbf5" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_713275e1-1335-485e-9329-b229d1a80479" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_af72106c-797a-48bd-97de-4b6085825521" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_af72106c-797a-48bd-97de-4b6085825521" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_17a732a1-469c-4b34-8761-fcbbc83571e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_CapitalizedContractCostNet_17a732a1-469c-4b34-8761-fcbbc83571e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableWithImputedInterestFaceAmount_80a12f27-62cb-4b01-ad0d-8c323c806b76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReceivableWithImputedInterestFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_ReceivableWithImputedInterestFaceAmount_80a12f27-62cb-4b01-ad0d-8c323c806b76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInterestRate_2528db60-2fba-4703-9c71-e49f2a9ef6f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_InvestmentInterestRate_2528db60-2fba-4703-9c71-e49f2a9ef6f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_f82e3e08-b814-4698-a95e-ea90caab87a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_0cac836a-b195-4fb5-9ca3-cf6b22419dfb" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_f82e3e08-b814-4698-a95e-ea90caab87a0" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CustomerContractsScheduleofAmortizationofCapitalizedContractCostsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CustomerContractsScheduleofAmortizationofCapitalizedContractCostsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CustomerContractsScheduleofAmortizationofCapitalizedContractCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostLineItems_ddd66926-b96c-4d58-bf58-1805501dbda9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostTable_359183ab-339f-43f9-90a9-e93595e9679c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_ddd66926-b96c-4d58-bf58-1805501dbda9" xlink:to="loc_us-gaap_CapitalizedContractCostTable_359183ab-339f-43f9-90a9-e93595e9679c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_27278700-9c1e-4f29-aaad-85c8d336d090" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_CapitalizedContractCostTable_359183ab-339f-43f9-90a9-e93595e9679c" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_27278700-9c1e-4f29-aaad-85c8d336d090" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_27278700-9c1e-4f29-aaad-85c8d336d090_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_27278700-9c1e-4f29-aaad-85c8d336d090" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_27278700-9c1e-4f29-aaad-85c8d336d090_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_0ff25f4d-3ef1-43a3-9920-724e30673baf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_27278700-9c1e-4f29-aaad-85c8d336d090" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_0ff25f4d-3ef1-43a3-9920-724e30673baf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SalesCommissionsMember_f3f93517-5cdc-425a-8d0c-4ca73f349ead" xlink:href="rxt-20231231.xsd#rxt_SalesCommissionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_0ff25f4d-3ef1-43a3-9920-724e30673baf" xlink:to="loc_rxt_SalesCommissionsMember_f3f93517-5cdc-425a-8d0c-4ca73f349ead" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ImplementationCostsMember_d3e3b446-db7e-4f82-a7f2-1b3616c840f8" xlink:href="rxt-20231231.xsd#rxt_ImplementationCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_0ff25f4d-3ef1-43a3-9920-724e30673baf" xlink:to="loc_rxt_ImplementationCostsMember_d3e3b446-db7e-4f82-a7f2-1b3616c840f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_bd825e90-d3f6-4230-87c3-8633dd7cd17a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostLineItems_ddd66926-b96c-4d58-bf58-1805501dbda9" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_bd825e90-d3f6-4230-87c3-8633dd7cd17a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CustomerContractsRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CustomerContractsRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CustomerContractsRemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f7e8697e-ae76-4f19-be8a-c4b452697e44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f7e8697e-ae76-4f19-be8a-c4b452697e44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c7aa01da-e459-4fdc-9f9d-0443bea40ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f7e8697e-ae76-4f19-be8a-c4b452697e44" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_c7aa01da-e459-4fdc-9f9d-0443bea40ce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_737c35cb-468d-49c3-bd45-745e4f09195c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_737c35cb-468d-49c3-bd45-745e4f09195c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_4cbf8107-4a5f-4355-9052-a6f1e9ecf3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_4cbf8107-4a5f-4355-9052-a6f1e9ecf3ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2f2295b5-47f8-49d3-8ce9-3ade1600b8a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2f2295b5-47f8-49d3-8ce9-3ade1600b8a1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CustomerContractsRemainingPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="rxt-20231231.xsd#CustomerContractsRemainingPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CustomerContractsRemainingPerformanceObligationsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f7e8697e-ae76-4f19-be8a-c4b452697e44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_f7e8697e-ae76-4f19-be8a-c4b452697e44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_737c35cb-468d-49c3-bd45-745e4f09195c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_737c35cb-468d-49c3-bd45-745e4f09195c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_4cbf8107-4a5f-4355-9052-a6f1e9ecf3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_4cbf8107-4a5f-4355-9052-a6f1e9ecf3ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2f2295b5-47f8-49d3-8ce9-3ade1600b8a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_2e506b85-f4ce-4d0d-8335-f9fe60311068" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_2f2295b5-47f8-49d3-8ce9-3ade1600b8a1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/SaleofReceivablesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#SaleofReceivablesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/SaleofReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4d529dd5-385a-4229-8a45-0e54485e2305" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_us-gaap_DebtInstrumentTable_4d529dd5-385a-4229-8a45-0e54485e2305" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4d529dd5-385a-4229-8a45-0e54485e2305" xlink:to="loc_dei_LegalEntityAxis_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6" xlink:to="loc_dei_EntityDomain_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_cfcbbafc-62d0-4b9f-8815-a7bb6eb05212" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_cdcc9d67-4d6c-49b6-a252-d22cf11c8df6" xlink:to="loc_dei_EntityDomain_cfcbbafc-62d0-4b9f-8815-a7bb6eb05212" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_RackspaceReceivablesIILLCSpecialPurposeVehicleSPVMember_b816a25c-cf7a-483f-bbea-c15af035a558" xlink:href="rxt-20231231.xsd#rxt_RackspaceReceivablesIILLCSpecialPurposeVehicleSPVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_cfcbbafc-62d0-4b9f-8815-a7bb6eb05212" xlink:to="loc_rxt_RackspaceReceivablesIILLCSpecialPurposeVehicleSPVMember_b816a25c-cf7a-483f-bbea-c15af035a558" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_TransferOfFinancialAssetsAccountedForAsSalesAggregateMaximumLimit_de537233-8a8a-49fa-ae48-5ea61ac039ff" xlink:href="rxt-20231231.xsd#rxt_TransferOfFinancialAssetsAccountedForAsSalesAggregateMaximumLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_rxt_TransferOfFinancialAssetsAccountedForAsSalesAggregateMaximumLimit_de537233-8a8a-49fa-ae48-5ea61ac039ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleExpense_7ce04585-1935-4628-af7b-86a68762a928" xlink:href="rxt-20231231.xsd#rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleExpense_7ce04585-1935-4628-af7b-86a68762a928" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale_8c30700a-2933-4c76-aa7e-27e9f09c6472" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale_8c30700a-2933-4c76-aa7e-27e9f09c6472" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleTransactionCosts_1ff4746d-ab02-4da4-bacd-23aeabb84f71" xlink:href="rxt-20231231.xsd#rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleTransactionCosts_1ff4746d-ab02-4da4-bacd-23aeabb84f71" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleDerecognized_b5acbc8d-488c-46bc-8c41-b3374e60b238" xlink:href="rxt-20231231.xsd#rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleDerecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleDerecognized_b5acbc8d-488c-46bc-8c41-b3374e60b238" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleCollateralPledged_33501eb2-ba3e-4bd0-8132-9c262497d6c5" xlink:href="rxt-20231231.xsd#rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleCollateralPledged"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a5a7f378-d838-4622-8250-4749827024a7" xlink:to="loc_rxt_SecuritizationOrAssetBackedFinancingArrangementFinancialAssetForWhichTransferIsAccountedAsSaleCollateralPledged_33501eb2-ba3e-4bd0-8132-9c262497d6c5" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/PropertyEquipmentandSoftwarenetScheduleofPropertyEquipmentandSoftwarenetDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#PropertyEquipmentandSoftwarenetScheduleofPropertyEquipmentandSoftwarenetDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/PropertyEquipmentandSoftwarenetScheduleofPropertyEquipmentandSoftwarenetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_becc1b2a-9775-48b6-a8f8-e88af8d4d166" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_becc1b2a-9775-48b6-a8f8-e88af8d4d166" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_becc1b2a-9775-48b6-a8f8-e88af8d4d166" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1c7c7b9a-3df7-4c6c-93e0-1aa2f12c435b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ComputerAndEquipmentMember_5c40b67d-d488-4cb6-ac24-05e8809e0271" xlink:href="rxt-20231231.xsd#rxt_ComputerAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:to="loc_rxt_ComputerAndEquipmentMember_5c40b67d-d488-4cb6-ac24-05e8809e0271" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_ea6f3d04-b593-4b23-a0df-87023d4de937" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_ea6f3d04-b593-4b23-a0df-87023d4de937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_37b740fe-27d8-4888-9acc-0badc7d24d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_37b740fe-27d8-4888-9acc-0badc7d24d9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BuildingsAndLeaseholdImprovementsMember_a7c836a5-ca3a-49d9-9e5f-1f8e2088c20f" xlink:href="rxt-20231231.xsd#rxt_BuildingsAndLeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:to="loc_rxt_BuildingsAndLeaseholdImprovementsMember_a7c836a5-ca3a-49d9-9e5f-1f8e2088c20f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_8def539e-a23c-4fdc-9faa-0969cb663e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c1ef05c9-85e9-4771-86d8-d1a9863fc594" xlink:to="loc_us-gaap_ConstructionInProgressMember_8def539e-a23c-4fdc-9faa-0969cb663e6f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationExcludingConstructionInProgress_25dd7d8e-6620-4cfe-aa2c-a6331d357525" xlink:href="rxt-20231231.xsd#rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationExcludingConstructionInProgress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:to="loc_rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationExcludingConstructionInProgress_25dd7d8e-6620-4cfe-aa2c-a6331d357525" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_d22bd7e7-2f6d-4811-b0c3-5236e99f89a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_d22bd7e7-2f6d-4811-b0c3-5236e99f89a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_8dd7efe1-458f-4892-9c0e-89bb55bd5cac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_8dd7efe1-458f-4892-9c0e-89bb55bd5cac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_a5290ac1-7b2b-4cf9-b191-6650bdc9d79b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_dfff2041-f153-46cc-85cb-5438c7e408de" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_a5290ac1-7b2b-4cf9-b191-6650bdc9d79b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/PropertyEquipmentandSoftwarenetNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#PropertyEquipmentandSoftwarenetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/PropertyEquipmentandSoftwarenetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f0a82a67-64c0-40f9-af8a-31f38b9f7186" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f0a82a67-64c0-40f9-af8a-31f38b9f7186" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d9b70941-c474-4e18-8edd-54f258e8ee6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f0a82a67-64c0-40f9-af8a-31f38b9f7186" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d9b70941-c474-4e18-8edd-54f258e8ee6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d9b70941-c474-4e18-8edd-54f258e8ee6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d9b70941-c474-4e18-8edd-54f258e8ee6c" xlink:to="loc_us-gaap_SegmentDomain_d9b70941-c474-4e18-8edd-54f258e8ee6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_120a97f0-fca8-451f-9afd-19f081e635c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d9b70941-c474-4e18-8edd-54f258e8ee6c" xlink:to="loc_us-gaap_SegmentDomain_120a97f0-fca8-451f-9afd-19f081e635c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OpenStackPublicCloudSegmentMember_d49631b4-2c9a-4f89-82d8-a768eb94fe1c" xlink:href="rxt-20231231.xsd#rxt_OpenStackPublicCloudSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_120a97f0-fca8-451f-9afd-19f081e635c0" xlink:to="loc_rxt_OpenStackPublicCloudSegmentMember_d49631b4-2c9a-4f89-82d8-a768eb94fe1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_f024c722-b661-4c46-92b0-0a866878967d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f0a82a67-64c0-40f9-af8a-31f38b9f7186" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_f024c722-b661-4c46-92b0-0a866878967d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_f024c722-b661-4c46-92b0-0a866878967d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_f024c722-b661-4c46-92b0-0a866878967d" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_f024c722-b661-4c46-92b0-0a866878967d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_afca17ca-e159-4029-9cbb-84790dbe935e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_f024c722-b661-4c46-92b0-0a866878967d" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_afca17ca-e159-4029-9cbb-84790dbe935e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CorporateHeadquartersFacilityMember_391a8866-afe8-47c7-ac58-560d9603a6c4" xlink:href="rxt-20231231.xsd#rxt_CorporateHeadquartersFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_afca17ca-e159-4029-9cbb-84790dbe935e" xlink:to="loc_rxt_CorporateHeadquartersFacilityMember_391a8866-afe8-47c7-ac58-560d9603a6c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_37f0473f-e1d3-4072-838e-545072cf0d09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_f0a82a67-64c0-40f9-af8a-31f38b9f7186" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_37f0473f-e1d3-4072-838e-545072cf0d09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_37f0473f-e1d3-4072-838e-545072cf0d09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_37f0473f-e1d3-4072-838e-545072cf0d09" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_37f0473f-e1d3-4072-838e-545072cf0d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_bf313229-7214-4baa-9f96-36dc6808d3bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_37f0473f-e1d3-4072-838e-545072cf0d09" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_bf313229-7214-4baa-9f96-36dc6808d3bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetMember_643db5de-339e-4cab-b846-60e0ba009fa2" xlink:href="rxt-20231231.xsd#rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_bf313229-7214-4baa-9f96-36dc6808d3bf" xlink:to="loc_rxt_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetMember_643db5de-339e-4cab-b846-60e0ba009fa2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAvailableForSale_7f1098e4-77f6-4332-8c41-ba2174e7412c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandAvailableForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_LandAvailableForSale_7f1098e4-77f6-4332-8c41-ba2174e7412c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLandHeldForUse_d153ca02-3438-498d-8747-3bbd6c93602f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfLandHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_ProceedsFromSaleOfLandHeldForUse_d153ca02-3438-498d-8747-3bbd6c93602f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PaymentsForBrokerageFeesAndProfessionalFees_b35761c3-f946-41cf-bcc8-cf1dbaa9cf15" xlink:href="rxt-20231231.xsd#rxt_PaymentsForBrokerageFeesAndProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_PaymentsForBrokerageFeesAndProfessionalFees_b35761c3-f946-41cf-bcc8-cf1dbaa9cf15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ProceedsFromSaleOfLandHeldForUseNetOfBrokerageAndProfessionalFees_1704cfba-3eda-4b55-a482-9f58fda0d7f7" xlink:href="rxt-20231231.xsd#rxt_ProceedsFromSaleOfLandHeldForUseNetOfBrokerageAndProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_ProceedsFromSaleOfLandHeldForUseNetOfBrokerageAndProfessionalFees_1704cfba-3eda-4b55-a482-9f58fda0d7f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_4a76334c-2e0c-4d1c-bdea-36ae09de39f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_4a76334c-2e0c-4d1c-bdea-36ae09de39f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyEquipmentAndSoftwareImpairmentCharges_1f524a17-ebfb-411a-a76e-81457065d772" xlink:href="rxt-20231231.xsd#rxt_PropertyEquipmentAndSoftwareImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_PropertyEquipmentAndSoftwareImpairmentCharges_1f524a17-ebfb-411a-a76e-81457065d772" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_951b7616-b1d7-414a-8b45-a6c00a193c5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_951b7616-b1d7-414a-8b45-a6c00a193c5d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_112e5564-489a-4858-bf76-bc6d1000478f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_112e5564-489a-4858-bf76-bc6d1000478f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyPlantAndEquipmentDisposalsConsideration_759ce334-8d13-4f5f-8ee5-5f0791a89c2a" xlink:href="rxt-20231231.xsd#rxt_PropertyPlantAndEquipmentDisposalsConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_PropertyPlantAndEquipmentDisposalsConsideration_759ce334-8d13-4f5f-8ee5-5f0791a89c2a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ImpairmentOfLongLivedAssetsToBeDisposedOfReversal_4d85d789-6003-4c07-bd93-3b07d558b55e" xlink:href="rxt-20231231.xsd#rxt_ImpairmentOfLongLivedAssetsToBeDisposedOfReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_ImpairmentOfLongLivedAssetsToBeDisposedOfReversal_4d85d789-6003-4c07-bd93-3b07d558b55e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyPlantAndEquipmentDisposalsConsiderationAdjustment_04603643-fadc-4e08-aa10-55fe1ed14845" xlink:href="rxt-20231231.xsd#rxt_PropertyPlantAndEquipmentDisposalsConsiderationAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_rxt_PropertyPlantAndEquipmentDisposalsConsiderationAdjustment_04603643-fadc-4e08-aa10-55fe1ed14845" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_dcd29884-1715-4eb3-baa8-114167e2c18a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b048bb87-34b4-4401-9b92-7f9a0fed92f2" xlink:to="loc_us-gaap_Depreciation_dcd29884-1715-4eb3-baa8-114167e2c18a" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountsofGoodwillbyReportableSegmentDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#GoodwillandIntangibleAssetsChangesinCarryingAmountsofGoodwillbyReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/GoodwillandIntangibleAssetsChangesinCarryingAmountsofGoodwillbyReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_53ddf0c9-4fae-4581-a6ad-bbd44f476c31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_53ddf0c9-4fae-4581-a6ad-bbd44f476c31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_994ff98c-6791-478b-aa10-663ee024aa7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_53ddf0c9-4fae-4581-a6ad-bbd44f476c31" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_994ff98c-6791-478b-aa10-663ee024aa7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_994ff98c-6791-478b-aa10-663ee024aa7f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_994ff98c-6791-478b-aa10-663ee024aa7f" xlink:to="loc_us-gaap_SegmentDomain_994ff98c-6791-478b-aa10-663ee024aa7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_994ff98c-6791-478b-aa10-663ee024aa7f" xlink:to="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PublicCloudServicesSegmentMember_17a74e2e-1f87-4f2d-ad30-557e9182af14" xlink:href="rxt-20231231.xsd#rxt_PublicCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:to="loc_rxt_PublicCloudServicesSegmentMember_17a74e2e-1f87-4f2d-ad30-557e9182af14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_8c27f350-c189-4987-95de-6fe3352df4ee" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_8c27f350-c189-4987-95de-6fe3352df4ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_MultiCloudServicesSegmentMember_0d9d3806-2ae9-4d1b-83ec-b4dd487407b6" xlink:href="rxt-20231231.xsd#rxt_MultiCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:to="loc_rxt_MultiCloudServicesSegmentMember_0d9d3806-2ae9-4d1b-83ec-b4dd487407b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AppsCrossPlatformSegmentMember_39c64346-87a5-4433-8ef0-5ddc9d1f4dba" xlink:href="rxt-20231231.xsd#rxt_AppsCrossPlatformSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:to="loc_rxt_AppsCrossPlatformSegmentMember_39c64346-87a5-4433-8ef0-5ddc9d1f4dba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OpenStackPublicCloudSegmentMember_d8e420d7-adcc-47eb-bac5-7338f55abe7e" xlink:href="rxt-20231231.xsd#rxt_OpenStackPublicCloudSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1d9b355a-6b62-4cfc-ab5b-5a50dd2d6d5b" xlink:to="loc_rxt_OpenStackPublicCloudSegmentMember_d8e420d7-adcc-47eb-bac5-7338f55abe7e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_ba30c3b7-5257-400f-896e-87f05157daa2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_53ddf0c9-4fae-4581-a6ad-bbd44f476c31" xlink:to="loc_srt_RestatementAxis_ba30c3b7-5257-400f-896e-87f05157daa2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_ba30c3b7-5257-400f-896e-87f05157daa2_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_ba30c3b7-5257-400f-896e-87f05157daa2" xlink:to="loc_srt_RestatementDomain_ba30c3b7-5257-400f-896e-87f05157daa2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_9e4f2f84-01ee-4ba4-89bd-a042e0a303df" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_ba30c3b7-5257-400f-896e-87f05157daa2" xlink:to="loc_srt_RestatementDomain_9e4f2f84-01ee-4ba4-89bd-a042e0a303df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_825dcb76-3757-4ee8-b9a0-e69f9702bf87" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_9e4f2f84-01ee-4ba4-89bd-a042e0a303df" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_825dcb76-3757-4ee8-b9a0-e69f9702bf87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_c421c276-8c3f-45dd-a105-f2ccd3a9261b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_NumberOfReportableSegments_c421c276-8c3f-45dd-a105-f2ccd3a9261b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_2e425436-de1b-4714-88f8-4e8420f5974c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_NumberOfOperatingSegments_2e425436-de1b-4714-88f8-4e8420f5974c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_c8b27e50-e1c9-4df4-9986-6683e99a570e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_GoodwillGross_c8b27e50-e1c9-4df4-9986-6683e99a570e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_53b81200-b79a-495b-9012-acba0b8e66ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_53b81200-b79a-495b-9012-acba0b8e66ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b6669212-c9ac-473b-ab55-55010ec21332" xlink:to="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_068be823-15ee-4469-a5a7-d32a12d0d96a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:to="loc_us-gaap_Goodwill_068be823-15ee-4469-a5a7-d32a12d0d96a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_60efb81e-26f5-4dd8-a75b-9fcf36927d52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_60efb81e-26f5-4dd8-a75b-9fcf36927d52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_2dfbb0ff-679b-4df3-83ab-3cd566b20ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_2dfbb0ff-679b-4df3-83ab-3cd566b20ca3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_af7a51c5-9256-4b35-b981-60deaaa20e04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_af7a51c5-9256-4b35-b981-60deaaa20e04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_49edc71d-db43-4e00-978d-1f6845f442a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_c7586ba6-8d91-4315-8fe7-c906bd2ab63e" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_49edc71d-db43-4e00-978d-1f6845f442a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_107cde54-6512-47e1-b62c-35a7faab28a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#GoodwillandIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/GoodwillandIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_9cee3dc7-3135-4d47-857c-a4464ca837d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_9cee3dc7-3135-4d47-857c-a4464ca837d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0999bb7c-2bbe-46e7-a329-3ce30c0022b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_9cee3dc7-3135-4d47-857c-a4464ca837d7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0999bb7c-2bbe-46e7-a329-3ce30c0022b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0999bb7c-2bbe-46e7-a329-3ce30c0022b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0999bb7c-2bbe-46e7-a329-3ce30c0022b6" xlink:to="loc_us-gaap_SegmentDomain_0999bb7c-2bbe-46e7-a329-3ce30c0022b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0999bb7c-2bbe-46e7-a329-3ce30c0022b6" xlink:to="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_8288e04d-16fa-4180-b178-67578c358fd2" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_8288e04d-16fa-4180-b178-67578c358fd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_MultiCloudServicesSegmentMember_301ab86c-6b82-4772-acf8-8932336f9482" xlink:href="rxt-20231231.xsd#rxt_MultiCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:to="loc_rxt_MultiCloudServicesSegmentMember_301ab86c-6b82-4772-acf8-8932336f9482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AppsCrossPlatformSegmentMember_d34e1492-d6c1-418a-9df4-e9c15b0896eb" xlink:href="rxt-20231231.xsd#rxt_AppsCrossPlatformSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:to="loc_rxt_AppsCrossPlatformSegmentMember_d34e1492-d6c1-418a-9df4-e9c15b0896eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OpenStackPublicCloudSegmentMember_804dcd96-4fd1-4f25-9f24-b253c63bf19a" xlink:href="rxt-20231231.xsd#rxt_OpenStackPublicCloudSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d3afd7b2-bba6-413e-b6f9-28e524688b3b" xlink:to="loc_rxt_OpenStackPublicCloudSegmentMember_804dcd96-4fd1-4f25-9f24-b253c63bf19a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_210fffec-3ec2-4380-b94f-52a2dc21e6d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_9cee3dc7-3135-4d47-857c-a4464ca837d7" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_210fffec-3ec2-4380-b94f-52a2dc21e6d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_210fffec-3ec2-4380-b94f-52a2dc21e6d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_210fffec-3ec2-4380-b94f-52a2dc21e6d2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_210fffec-3ec2-4380-b94f-52a2dc21e6d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_051b54ed-479c-4037-8947-17a466d9e65e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_210fffec-3ec2-4380-b94f-52a2dc21e6d2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_051b54ed-479c-4037-8947-17a466d9e65e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_9341a957-7c02-4add-9810-32985b1c0776" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_051b54ed-479c-4037-8947-17a466d9e65e" xlink:to="loc_us-gaap_TradeNamesMember_9341a957-7c02-4add-9810-32985b1c0776" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2fdf535-df25-4924-9c8b-ea92803dde6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_9cee3dc7-3135-4d47-857c-a4464ca837d7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2fdf535-df25-4924-9c8b-ea92803dde6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c2fdf535-df25-4924-9c8b-ea92803dde6e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2fdf535-df25-4924-9c8b-ea92803dde6e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c2fdf535-df25-4924-9c8b-ea92803dde6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27525033-e6b5-4a2f-b37f-9c078f054234" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c2fdf535-df25-4924-9c8b-ea92803dde6e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27525033-e6b5-4a2f-b37f-9c078f054234" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PropertyTaxAbatementMember_134fd1fd-2b11-4e9e-b828-60f0ddb3e957" xlink:href="rxt-20231231.xsd#rxt_PropertyTaxAbatementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_27525033-e6b5-4a2f-b37f-9c078f054234" xlink:to="loc_rxt_PropertyTaxAbatementMember_134fd1fd-2b11-4e9e-b828-60f0ddb3e957" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_998b0fe5-6489-449f-a7da-33489e5386f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_998b0fe5-6489-449f-a7da-33489e5386f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_905f5de3-03ae-40c3-b31c-e564aaa14779" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_905f5de3-03ae-40c3-b31c-e564aaa14779" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_05bb7704-2a17-4b66-b3c4-fcfc86c92776" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_05bb7704-2a17-4b66-b3c4-fcfc86c92776" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetIndefiniteLivedExcludingGoodwillStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_f6e09bda-48ea-4d87-a7c6-f138c55bb961" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetIndefiniteLivedExcludingGoodwillStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetIndefiniteLivedExcludingGoodwillStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_f6e09bda-48ea-4d87-a7c6-f138c55bb961" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_351bc0e4-1736-41fa-9b32-5a45291f487a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_351bc0e4-1736-41fa-9b32-5a45291f487a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_2721ecdd-a2cd-4f72-a7de-4726ecccdb54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_2721ecdd-a2cd-4f72-a7de-4726ecccdb54" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_4a55d2b4-3193-48b3-bd2f-e9e35a11b923" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_08fe51b0-80fc-441e-bb44-4709c433bf0f" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_4a55d2b4-3193-48b3-bd2f-e9e35a11b923" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/GoodwillandIntangibleAssetsIntangibleAssetsOtherThanGoodwillDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#GoodwillandIntangibleAssetsIntangibleAssetsOtherThanGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/GoodwillandIntangibleAssetsIntangibleAssetsOtherThanGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1487d3f5-f6ca-4aec-966b-731df5731397" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_124f8fa4-55df-4ad7-a44f-ff06e0b1103b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1487d3f5-f6ca-4aec-966b-731df5731397" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_124f8fa4-55df-4ad7-a44f-ff06e0b1103b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_dfa03db2-eb70-415b-bb3d-77866699aeda" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_124f8fa4-55df-4ad7-a44f-ff06e0b1103b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_dfa03db2-eb70-415b-bb3d-77866699aeda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dfa03db2-eb70-415b-bb3d-77866699aeda_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_dfa03db2-eb70-415b-bb3d-77866699aeda" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_dfa03db2-eb70-415b-bb3d-77866699aeda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6486fdd-dc27-4d3e-87a0-67ed8eb8ce34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_dfa03db2-eb70-415b-bb3d-77866699aeda" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6486fdd-dc27-4d3e-87a0-67ed8eb8ce34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_4dec6e98-76c6-41ec-be6e-aa1376b5cccf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6486fdd-dc27-4d3e-87a0-67ed8eb8ce34" xlink:to="loc_us-gaap_CustomerRelationshipsMember_4dec6e98-76c6-41ec-be6e-aa1376b5cccf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_950f260e-f5a4-4783-ae3e-3eb2774e4ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6486fdd-dc27-4d3e-87a0-67ed8eb8ce34" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_950f260e-f5a4-4783-ae3e-3eb2774e4ba8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_61eecae8-cf6e-4b03-8865-faba32ddddcd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1487d3f5-f6ca-4aec-966b-731df5731397" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_61eecae8-cf6e-4b03-8865-faba32ddddcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ef269e84-dcf4-4840-a4da-58218f698be1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1487d3f5-f6ca-4aec-966b-731df5731397" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ef269e84-dcf4-4840-a4da-58218f698be1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_781e9d87-51a7-480b-9ab3-71386a800a58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1487d3f5-f6ca-4aec-966b-731df5731397" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_781e9d87-51a7-480b-9ab3-71386a800a58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_6abfe859-37ba-4e59-9af3-97994430e711" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_562c9b2b-6bd7-4a26-bc53-8f821c717e1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_6abfe859-37ba-4e59-9af3-97994430e711" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_562c9b2b-6bd7-4a26-bc53-8f821c717e1a" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_cd07eb94-32c5-4417-8a3a-105fa8511f48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_562c9b2b-6bd7-4a26-bc53-8f821c717e1a" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_cd07eb94-32c5-4417-8a3a-105fa8511f48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_cd07eb94-32c5-4417-8a3a-105fa8511f48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_cd07eb94-32c5-4417-8a3a-105fa8511f48" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_cd07eb94-32c5-4417-8a3a-105fa8511f48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_09138677-0b23-4127-b628-454cfeaaff14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_cd07eb94-32c5-4417-8a3a-105fa8511f48" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_09138677-0b23-4127-b628-454cfeaaff14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_2c6d8fc9-5f69-4895-b5e8-62b1610766d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_09138677-0b23-4127-b628-454cfeaaff14" xlink:to="loc_us-gaap_TradeNamesMember_2c6d8fc9-5f69-4895-b5e8-62b1610766d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_754a4887-253c-4a81-a9aa-6eaa8f08eeb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_6abfe859-37ba-4e59-9af3-97994430e711" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_754a4887-253c-4a81-a9aa-6eaa8f08eeb6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f05aa71a-1f0b-4bf5-981d-fc2f8f1deccb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DebtInstrumentTable_f05aa71a-1f0b-4bf5-981d-fc2f8f1deccb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f05aa71a-1f0b-4bf5-981d-fc2f8f1deccb" xlink:to="loc_us-gaap_DebtInstrumentAxis_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b2a8eb9d-f1cf-4009-961e-caad0e43c0a0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CurrentTermLoanFacilityMember_377a9183-ff1b-46d2-a1fb-d33a59a199d9" xlink:href="rxt-20231231.xsd#rxt_CurrentTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:to="loc_rxt_CurrentTermLoanFacilityMember_377a9183-ff1b-46d2-a1fb-d33a59a199d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_FirstLienCreditAgreementMember_27ef868a-15c1-46b3-8410-ddcfc70eef6d" xlink:href="rxt-20231231.xsd#rxt_FirstLienCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:to="loc_rxt_FirstLienCreditAgreementMember_27ef868a-15c1-46b3-8410-ddcfc70eef6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A350SeniorSecuredNotesDue2028Member_87c330f3-ad46-4260-ba69-6e791904c46f" xlink:href="rxt-20231231.xsd#rxt_A350SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:to="loc_rxt_A350SeniorSecuredNotesDue2028Member_87c330f3-ad46-4260-ba69-6e791904c46f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SeniorNotes5375Due2028Member_a4b291ae-a6d6-4a03-bb3b-313b84d012cc" xlink:href="rxt-20231231.xsd#rxt_SeniorNotes5375Due2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a6513e91-ada1-42a4-b545-e43868aabd6c" xlink:to="loc_rxt_SeniorNotes5375Due2028Member_a4b291ae-a6d6-4a03-bb3b-313b84d012cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f05aa71a-1f0b-4bf5-981d-fc2f8f1deccb" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fd13a624-6b0f-44b4-a61e-82e4e414978e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_8b70e9a5-7f6c-4a21-8dfb-814041e6f6a3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fd13a624-6b0f-44b4-a61e-82e4e414978e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_2d5b3c2b-ee3d-4e9e-89d5-51e80dda74ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fd13a624-6b0f-44b4-a61e-82e4e414978e" xlink:to="loc_us-gaap_SecuredDebtMember_2d5b3c2b-ee3d-4e9e-89d5-51e80dda74ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_cf9ee1d6-5e8a-494e-ab41-6481d90b746d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fd13a624-6b0f-44b4-a61e-82e4e414978e" xlink:to="loc_us-gaap_LineOfCreditMember_cf9ee1d6-5e8a-494e-ab41-6481d90b746d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_9c3892bf-de91-40dc-be71-28b94daa558f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fd13a624-6b0f-44b4-a61e-82e4e414978e" xlink:to="loc_us-gaap_SeniorNotesMember_9c3892bf-de91-40dc-be71-28b94daa558f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_a04d6e5b-1188-4506-bab8-5e6686a506b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f05aa71a-1f0b-4bf5-981d-fc2f8f1deccb" xlink:to="loc_us-gaap_CreditFacilityAxis_a04d6e5b-1188-4506-bab8-5e6686a506b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_a04d6e5b-1188-4506-bab8-5e6686a506b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_a04d6e5b-1188-4506-bab8-5e6686a506b2" xlink:to="loc_us-gaap_CreditFacilityDomain_a04d6e5b-1188-4506-bab8-5e6686a506b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bc9b0502-6a47-4456-98b8-efcc8edc6c97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_a04d6e5b-1188-4506-bab8-5e6686a506b2" xlink:to="loc_us-gaap_CreditFacilityDomain_bc9b0502-6a47-4456-98b8-efcc8edc6c97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_b954f3c2-6569-4716-94ca-57048325df88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bc9b0502-6a47-4456-98b8-efcc8edc6c97" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_b954f3c2-6569-4716-94ca-57048325df88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ffa96a32-b12a-4927-9b12-9e4c88a8ec36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ffa96a32-b12a-4927-9b12-9e4c88a8ec36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_8341fdf7-7099-442d-946d-9fc4ac2aece6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_8341fdf7-7099-442d-946d-9fc4ac2aece6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_bd5e132e-53fc-4449-9a53-dd85b4cacc2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_LineOfCredit_bd5e132e-53fc-4449-9a53-dd85b4cacc2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0d7d459b-f37b-4f9b-91f4-e0b2f59c3df3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0d7d459b-f37b-4f9b-91f4-e0b2f59c3df3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_19887f52-f3ae-4d42-9296-15f4fb25faf6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_19887f52-f3ae-4d42-9296-15f4fb25faf6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_1db132bb-f394-4ede-b9f4-4af17a108917" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_1db132bb-f394-4ede-b9f4-4af17a108917" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_38aee0d2-58c4-4861-a966-cb999d885daf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_LongTermDebt_38aee0d2-58c4-4861-a966-cb999d885daf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_838a18a0-551d-4b7c-af69-4e5eecde9641" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_LongTermDebtCurrent_838a18a0-551d-4b7c-af69-4e5eecde9641" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_19f17556-e91d-47fc-9b4c-58a7c3217187" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ab895aa5-d72a-4d27-b080-09a779141dd0" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_19f17556-e91d-47fc-9b4c-58a7c3217187" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_5e41adf6-7541-410c-b5c2-a62a8c7086b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_DebtInstrumentAxis_5e41adf6-7541-410c-b5c2-a62a8c7086b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5e41adf6-7541-410c-b5c2-a62a8c7086b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_5e41adf6-7541-410c-b5c2-a62a8c7086b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5e41adf6-7541-410c-b5c2-a62a8c7086b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_5e41adf6-7541-410c-b5c2-a62a8c7086b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CurrentTermLoanFacilityMember_8b917f12-6c4c-44a1-bbd9-7e385ef8c14f" xlink:href="rxt-20231231.xsd#rxt_CurrentTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_CurrentTermLoanFacilityMember_8b917f12-6c4c-44a1-bbd9-7e385ef8c14f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A350SeniorSecuredNotesDue2028Member_25e4755b-4d3b-4315-a99f-c8ea5318c466" xlink:href="rxt-20231231.xsd#rxt_A350SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_A350SeniorSecuredNotesDue2028Member_25e4755b-4d3b-4315-a99f-c8ea5318c466" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_FirstLienCreditAgreementMember_ecdb4db0-d5aa-4907-9e2a-7ae35a53f997" xlink:href="rxt-20231231.xsd#rxt_FirstLienCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_FirstLienCreditAgreementMember_ecdb4db0-d5aa-4907-9e2a-7ae35a53f997" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SeniorNotes5375Due2028Member_dc0a40e6-214f-4a81-bbdd-d70057bceb58" xlink:href="rxt-20231231.xsd#rxt_SeniorNotes5375Due2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_SeniorNotes5375Due2028Member_dc0a40e6-214f-4a81-bbdd-d70057bceb58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ReceivablesFinancingFacilityMember_ac5dea16-8be2-4ef3-8991-fc69611d7135" xlink:href="rxt-20231231.xsd#rxt_ReceivablesFinancingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_ReceivablesFinancingFacilityMember_ac5dea16-8be2-4ef3-8991-fc69611d7135" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PriorTermLoanFacilityMember_43f4c102-5b55-4c80-ba82-e9eb0eb89861" xlink:href="rxt-20231231.xsd#rxt_PriorTermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4a0dac3-4dce-4cbc-a21d-694ce3ad3459" xlink:to="loc_rxt_PriorTermLoanFacilityMember_43f4c102-5b55-4c80-ba82-e9eb0eb89861" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f496c95b-3d70-4d54-8014-b057a4216372" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f496c95b-3d70-4d54-8014-b057a4216372" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f496c95b-3d70-4d54-8014-b057a4216372_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f496c95b-3d70-4d54-8014-b057a4216372" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f496c95b-3d70-4d54-8014-b057a4216372_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0b40957e-80d3-4754-8c11-dcff460e00bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f496c95b-3d70-4d54-8014-b057a4216372" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0b40957e-80d3-4754-8c11-dcff460e00bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_e4c030ea-2bd7-4c02-ac2e-e0efecb38ca2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0b40957e-80d3-4754-8c11-dcff460e00bd" xlink:to="loc_us-gaap_SecuredDebtMember_e4c030ea-2bd7-4c02-ac2e-e0efecb38ca2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_a328bf40-e6d8-43ed-ad60-657f3fa1e958" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0b40957e-80d3-4754-8c11-dcff460e00bd" xlink:to="loc_us-gaap_LineOfCreditMember_a328bf40-e6d8-43ed-ad60-657f3fa1e958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_5c5bc9fe-cd42-42af-ad35-d7cd0d9fe14a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0b40957e-80d3-4754-8c11-dcff460e00bd" xlink:to="loc_us-gaap_SeniorNotesMember_5c5bc9fe-cd42-42af-ad35-d7cd0d9fe14a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_c47b7f66-4a74-4924-acdf-98a340ff5808" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_CreditFacilityAxis_c47b7f66-4a74-4924-acdf-98a340ff5808" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c47b7f66-4a74-4924-acdf-98a340ff5808_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_c47b7f66-4a74-4924-acdf-98a340ff5808" xlink:to="loc_us-gaap_CreditFacilityDomain_c47b7f66-4a74-4924-acdf-98a340ff5808_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_dc54a17f-6bd3-42b9-bef1-52e51b23e44b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_c47b7f66-4a74-4924-acdf-98a340ff5808" xlink:to="loc_us-gaap_CreditFacilityDomain_dc54a17f-6bd3-42b9-bef1-52e51b23e44b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_0a9e616b-9b12-48e0-b69f-d8ce27d920d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_dc54a17f-6bd3-42b9-bef1-52e51b23e44b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_0a9e616b-9b12-48e0-b69f-d8ce27d920d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_VariableRateAxis_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c" xlink:to="loc_us-gaap_VariableRateDomain_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d1e5edd6-80b3-4899-abca-d903db089837" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_f17a5d9f-c92f-416f-b6e1-7c85a4bc9b0c" xlink:to="loc_us-gaap_VariableRateDomain_d1e5edd6-80b3-4899-abca-d903db089837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_65546ade-4c5c-4f49-b6c1-07efb41f37fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d1e5edd6-80b3-4899-abca-d903db089837" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_65546ade-4c5c-4f49-b6c1-07efb41f37fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuredOvernightFinancingRateSOFRMember_221f3329-3429-4dc0-8a2d-945c33a8cc46" xlink:href="rxt-20231231.xsd#rxt_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d1e5edd6-80b3-4899-abca-d903db089837" xlink:to="loc_rxt_SecuredOvernightFinancingRateSOFRMember_221f3329-3429-4dc0-8a2d-945c33a8cc46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_6921ba65-9dd7-49d7-8b6a-10e49b998283" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d1e5edd6-80b3-4899-abca-d903db089837" xlink:to="loc_us-gaap_BaseRateMember_6921ba65-9dd7-49d7-8b6a-10e49b998283" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_srt_StatementScenarioAxis_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_c98475e3-fc75-4f60-84f8-813097423409" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_3b3e250b-aef4-44e4-85da-eb5cf6bbe3c9" xlink:to="loc_srt_ScenarioUnspecifiedDomain_c98475e3-fc75-4f60-84f8-813097423409" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_3a45d939-9195-47e7-b094-2d0f39d21328" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_c98475e3-fc75-4f60-84f8-813097423409" xlink:to="loc_srt_ScenarioForecastMember_3a45d939-9195-47e7-b094-2d0f39d21328" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_e2d3e1e7-95ab-4f88-9a8d-47b13ece071f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentRedemptionPeriodSixMember_5003718c-505a-4bd6-85c3-1b48cda82cc9" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentRedemptionPeriodSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_rxt_DebtInstrumentRedemptionPeriodSixMember_5003718c-505a-4bd6-85c3-1b48cda82cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentRedemptionPeriodSevenMember_26f466fc-9ca0-4f6e-ba83-6478ffba9be3" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentRedemptionPeriodSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_rxt_DebtInstrumentRedemptionPeriodSevenMember_26f466fc-9ca0-4f6e-ba83-6478ffba9be3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentRedemptionPeriodNineMember_9de54b6a-e077-4a78-9f2a-1a489b995c10" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentRedemptionPeriodNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_rxt_DebtInstrumentRedemptionPeriodNineMember_9de54b6a-e077-4a78-9f2a-1a489b995c10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentRedemptionPeriodTenMember_7d898d15-72f9-4985-9af4-3f88d3ea8ee5" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentRedemptionPeriodTenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_rxt_DebtInstrumentRedemptionPeriodTenMember_7d898d15-72f9-4985-9af4-3f88d3ea8ee5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_bd2e2834-96ee-4a87-9fd6-7ea011ea550d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodFourMember_bd2e2834-96ee-4a87-9fd6-7ea011ea550d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_f0009f60-b438-4d2a-a267-fa8b1996a2b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_f0009f60-b438-4d2a-a267-fa8b1996a2b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_a7bfcd89-ce58-4041-9a54-ee5c42c02490" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_a7bfcd89-ce58-4041-9a54-ee5c42c02490" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_9ff36b02-7ae2-4b77-8ffc-03716e117e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_a86e91d9-dc98-4b42-8a69-c69dc0c3da6f" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_9ff36b02-7ae2-4b77-8ffc-03716e117e7d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateDurationTermAxis_26d8bad1-a41a-4374-a8f2-79b8553952e5" xlink:href="rxt-20231231.xsd#rxt_InterestRateDurationTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_rxt_InterestRateDurationTermAxis_26d8bad1-a41a-4374-a8f2-79b8553952e5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateDurationTermDomain_26d8bad1-a41a-4374-a8f2-79b8553952e5_default" xlink:href="rxt-20231231.xsd#rxt_InterestRateDurationTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_rxt_InterestRateDurationTermAxis_26d8bad1-a41a-4374-a8f2-79b8553952e5" xlink:to="loc_rxt_InterestRateDurationTermDomain_26d8bad1-a41a-4374-a8f2-79b8553952e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateDurationTermDomain_fe54f2b5-b11a-402a-b414-75a8163b02cf" xlink:href="rxt-20231231.xsd#rxt_InterestRateDurationTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_rxt_InterestRateDurationTermAxis_26d8bad1-a41a-4374-a8f2-79b8553952e5" xlink:to="loc_rxt_InterestRateDurationTermDomain_fe54f2b5-b11a-402a-b414-75a8163b02cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OneMonthDurationTermMember_14ba5cae-6705-4d4f-806a-458df4edbf73" xlink:href="rxt-20231231.xsd#rxt_OneMonthDurationTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxt_InterestRateDurationTermDomain_fe54f2b5-b11a-402a-b414-75a8163b02cf" xlink:to="loc_rxt_OneMonthDurationTermMember_14ba5cae-6705-4d4f-806a-458df4edbf73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ThreeMonthDurationTermMember_6fdc9f5e-6747-4ba0-8092-9d5193a913e1" xlink:href="rxt-20231231.xsd#rxt_ThreeMonthDurationTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxt_InterestRateDurationTermDomain_fe54f2b5-b11a-402a-b414-75a8163b02cf" xlink:to="loc_rxt_ThreeMonthDurationTermMember_6fdc9f5e-6747-4ba0-8092-9d5193a913e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SixMonthsDurationTermMember_34e8c313-fb40-47ca-8f1a-2f5e67433e5d" xlink:href="rxt-20231231.xsd#rxt_SixMonthsDurationTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxt_InterestRateDurationTermDomain_fe54f2b5-b11a-402a-b414-75a8163b02cf" xlink:to="loc_rxt_SixMonthsDurationTermMember_34e8c313-fb40-47ca-8f1a-2f5e67433e5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_8faf6f70-3408-4a89-9f70-d69f29de9c3b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_srt_CounterpartyNameAxis_8faf6f70-3408-4a89-9f70-d69f29de9c3b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_8faf6f70-3408-4a89-9f70-d69f29de9c3b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_8faf6f70-3408-4a89-9f70-d69f29de9c3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_8faf6f70-3408-4a89-9f70-d69f29de9c3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_10f7e29b-d8bc-4058-9a29-6b5afe215dc4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_8faf6f70-3408-4a89-9f70-d69f29de9c3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_10f7e29b-d8bc-4058-9a29-6b5afe215dc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AffiliatesOfABRYMember_af1ebfed-0960-4d20-ad97-119b81d81d54" xlink:href="rxt-20231231.xsd#rxt_AffiliatesOfABRYMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_10f7e29b-d8bc-4058-9a29-6b5afe215dc4" xlink:to="loc_rxt_AffiliatesOfABRYMember_af1ebfed-0960-4d20-ad97-119b81d81d54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ApolloGlobalManagementIncMember_f4214fbe-14ae-4784-97dc-626b78228a7e" xlink:href="rxt-20231231.xsd#rxt_ApolloGlobalManagementIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_10f7e29b-d8bc-4058-9a29-6b5afe215dc4" xlink:to="loc_rxt_ApolloGlobalManagementIncMember_f4214fbe-14ae-4784-97dc-626b78228a7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4e48b098-3c8a-430b-b603-7aa4184a979e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4e48b098-3c8a-430b-b603-7aa4184a979e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_4e48b098-3c8a-430b-b603-7aa4184a979e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4e48b098-3c8a-430b-b603-7aa4184a979e" xlink:to="loc_us-gaap_RelatedPartyDomain_4e48b098-3c8a-430b-b603-7aa4184a979e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_c89dae8e-b174-4043-979b-edbf9364e49d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_4e48b098-3c8a-430b-b603-7aa4184a979e" xlink:to="loc_us-gaap_RelatedPartyDomain_c89dae8e-b174-4043-979b-edbf9364e49d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_3851f850-54fe-407a-8182-8588e2eb8edb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_c89dae8e-b174-4043-979b-edbf9364e49d" xlink:to="loc_us-gaap_RelatedPartyMember_3851f850-54fe-407a-8182-8588e2eb8edb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_1e16df88-12b5-4a0c-a571-8edc0c051bdc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4748ce07-4957-408f-b646-420f66a31d7b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_1e16df88-12b5-4a0c-a571-8edc0c051bdc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1e16df88-12b5-4a0c-a571-8edc0c051bdc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1e16df88-12b5-4a0c-a571-8edc0c051bdc" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1e16df88-12b5-4a0c-a571-8edc0c051bdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_cabe8721-6a11-4d9d-8c72-512f3763f4f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1e16df88-12b5-4a0c-a571-8edc0c051bdc" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_cabe8721-6a11-4d9d-8c72-512f3763f4f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_0351c741-0ee3-4eca-b604-1898f420a37d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_cabe8721-6a11-4d9d-8c72-512f3763f4f7" xlink:to="loc_us-gaap_SubsequentEventMember_0351c741-0ee3-4eca-b604-1898f420a37d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_4a625dd4-6cef-4cb2-953a-70350dd0760e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentTerm_4a625dd4-6cef-4cb2-953a-70350dd0760e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_cc01504e-3a3a-432d-a6f6-ff63f25c806f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_cc01504e-3a3a-432d-a6f6-ff63f25c806f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_e552078f-8c58-4dfc-be6b-c4620a95a6f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_e552078f-8c58-4dfc-be6b-c4620a95a6f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_06657a51-f7b0-4562-b39d-7a88e78b813d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_06657a51-f7b0-4562-b39d-7a88e78b813d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentBasisSpreadOnVariableRateFloor_b37d7b84-5ff5-4d0d-bc57-4af1fd8c2c93" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentBasisSpreadOnVariableRateFloor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentBasisSpreadOnVariableRateFloor_b37d7b84-5ff5-4d0d-bc57-4af1fd8c2c93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b0521b80-063d-4455-9f38-c6d3b267ee81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b0521b80-063d-4455-9f38-c6d3b267ee81" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentBasisSpreadCreditAdjustment_59c856f4-893a-4309-b981-bfa75a520460" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentBasisSpreadCreditAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentBasisSpreadCreditAdjustment_59c856f4-893a-4309-b981-bfa75a520460" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentInterestPaymentPeriodMaximum_0a0102b2-3122-4fc6-8dc3-0025ded8d799" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentInterestPaymentPeriodMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentInterestPaymentPeriodMaximum_0a0102b2-3122-4fc6-8dc3-0025ded8d799" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_61512fe4-d32b-47bf-9c82-bddf576ae853" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_61512fe4-d32b-47bf-9c82-bddf576ae853" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_74a25742-d0ec-4956-b356-dc076e31d833" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_74a25742-d0ec-4956-b356-dc076e31d833" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_025b557c-1061-455e-8e5b-cf300bb25ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_025b557c-1061-455e-8e5b-cf300bb25ac7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_a834be13-660e-4c68-ae64-6d19f9bb6a13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_a834be13-660e-4c68-ae64-6d19f9bb6a13" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_74c6e7f2-8274-4041-bdc0-93f0656f08ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_74c6e7f2-8274-4041-bdc0-93f0656f08ca" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIncreaseAccruedInterest_d6bb45ba-e589-499b-9f80-6bea1c8845b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentIncreaseAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentIncreaseAccruedInterest_d6bb45ba-e589-499b-9f80-6bea1c8845b3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_1e2a656e-7d6a-4969-b501-46e8b5abdba0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_1e2a656e-7d6a-4969-b501-46e8b5abdba0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_d01425da-f912-4961-9a91-f1807e001328" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_d01425da-f912-4961-9a91-f1807e001328" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_e9dab1c4-92f6-4913-9d40-06f9c6b9c50f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LongTermDebtFairValue_e9dab1c4-92f6-4913-9d40-06f9c6b9c50f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentCovenantLeverageRatioMaximum_8e168b5f-5247-4dd6-b1e2-ada733662ff8" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentCovenantLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentCovenantLeverageRatioMaximum_8e168b5f-5247-4dd6-b1e2-ada733662ff8" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentCovenantUndrawnLettersOfCreditAndCashCollateralizedLettersOfCreditExcludedFromThresholdTrigger_010b30e6-fab0-47a1-8b7b-6fe935711ec7" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentCovenantUndrawnLettersOfCreditAndCashCollateralizedLettersOfCreditExcludedFromThresholdTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentCovenantUndrawnLettersOfCreditAndCashCollateralizedLettersOfCreditExcludedFromThresholdTrigger_010b30e6-fab0-47a1-8b7b-6fe935711ec7" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentCovenantPercentageOfOutstandingBorrowingsTriggerMinimum_e93b4665-aa01-4930-89a3-92d53c64dc5e" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentCovenantPercentageOfOutstandingBorrowingsTriggerMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentCovenantPercentageOfOutstandingBorrowingsTriggerMinimum_e93b4665-aa01-4930-89a3-92d53c64dc5e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_fecf0f85-a807-4e37-877f-12cb60d3fd9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_fecf0f85-a807-4e37-877f-12cb60d3fd9f" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_4e3495cc-452d-4bd9-a0f8-af1cb8e7c950" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LineOfCredit_4e3495cc-452d-4bd9-a0f8-af1cb8e7c950" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_a07e625e-fde7-48ec-9081-73cd6bf200c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_a07e625e-fde7-48ec-9081-73cd6bf200c9" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_bc90f4d7-f3d4-4bba-ac66-53da47a310e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_bc90f4d7-f3d4-4bba-ac66-53da47a310e5" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_d6b371bb-47c3-4dc2-8964-16ded751f88f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_d6b371bb-47c3-4dc2-8964-16ded751f88f" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentPercentOfRedeemableDebt_b4d6f9e4-9d18-4d78-9b03-4e2e09d51658" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentPercentOfRedeemableDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentPercentOfRedeemableDebt_b4d6f9e4-9d18-4d78-9b03-4e2e09d51658" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentRedemptionPeriod_9759c049-a4ca-4405-8c55-290799016e91" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentRedemptionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentRedemptionPeriod_9759c049-a4ca-4405-8c55-290799016e91" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_11791f00-6829-4718-a4d1-3f1fd3862bd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentFairValue_11791f00-6829-4718-a4d1-3f1fd3862bd0" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_9f5cffbc-4aa0-47a2-95f8-9b02ba3196bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_RepaymentsOfDebt_9f5cffbc-4aa0-47a2-95f8-9b02ba3196bc" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_6c4028b7-fd42-4a53-83fc-774a5d17ad2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_6c4028b7-fd42-4a53-83fc-774a5d17ad2d" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_93b2af55-113c-44b4-a609-2987869d26dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_93b2af55-113c-44b4-a609-2987869d26dd" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PercentageOfOutstandingPrincipalAmountDueToRelatedParty_5c1077a2-81e2-4ebe-be45-bd2ad5c149bb" xlink:href="rxt-20231231.xsd#rxt_PercentageOfOutstandingPrincipalAmountDueToRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_PercentageOfOutstandingPrincipalAmountDueToRelatedParty_5c1077a2-81e2-4ebe-be45-bd2ad5c149bb" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_68d2b213-c482-481f-a260-83bd49a43f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_68d2b213-c482-481f-a260-83bd49a43f8a" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_a2d242c8-4cb6-410b-9950-c3e23835f1aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_a2d242c8-4cb6-410b-9950-c3e23835f1aa" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DebtInstrumentModificationFee_810e7140-7e9f-4dd0-9059-c0664b138e5d" xlink:href="rxt-20231231.xsd#rxt_DebtInstrumentModificationFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2aa8f111-8008-4256-b9cc-6d468bf77c70" xlink:to="loc_rxt_DebtInstrumentModificationFee_810e7140-7e9f-4dd0-9059-c0664b138e5d" xlink:type="arc" order="34"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/LeasesPropertyandEquipmentUnderFinanceLeasesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#LeasesPropertyandEquipmentUnderFinanceLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/LeasesPropertyandEquipmentUnderFinanceLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_a119e812-870a-43ec-8baa-11b2f2d8b700" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_39c4e42c-2506-4dc7-baf5-f1ae4468e71a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a119e812-870a-43ec-8baa-11b2f2d8b700" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_39c4e42c-2506-4dc7-baf5-f1ae4468e71a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_39c4e42c-2506-4dc7-baf5-f1ae4468e71a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_39bd2aaf-984e-4b29-8802-2ec05011b749" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b1cdfc9e-95b0-45d5-8cd5-729ebbb0dd98" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_39bd2aaf-984e-4b29-8802-2ec05011b749" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ComputerAndEquipmentMember_2d6f683e-020e-46a2-be7d-99ff5da21c89" xlink:href="rxt-20231231.xsd#rxt_ComputerAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_39bd2aaf-984e-4b29-8802-2ec05011b749" xlink:to="loc_rxt_ComputerAndEquipmentMember_2d6f683e-020e-46a2-be7d-99ff5da21c89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_17c21ae5-0bf8-48cf-a811-1d715f870ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_39bd2aaf-984e-4b29-8802-2ec05011b749" xlink:to="loc_us-gaap_BuildingMember_17c21ae5-0bf8-48cf-a811-1d715f870ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_2041b9d9-9b7b-45b5-911e-48ef5449cd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a119e812-870a-43ec-8baa-11b2f2d8b700" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_2041b9d9-9b7b-45b5-911e-48ef5449cd5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_957d09e6-0110-4675-904e-05f23bad100d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a119e812-870a-43ec-8baa-11b2f2d8b700" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_957d09e6-0110-4675-904e-05f23bad100d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_a80e76ab-bd46-4bac-8788-c0232b783220" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a119e812-870a-43ec-8baa-11b2f2d8b700" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_a80e76ab-bd46-4bac-8788-c0232b783220" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_38115d5a-46d3-4587-a4f1-fec41cc5ecf2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:to="loc_us-gaap_OtherCommitmentsTable_38115d5a-46d3-4587-a4f1-fec41cc5ecf2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_3e15ecc3-1da0-4d0d-903d-55e680972b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_38115d5a-46d3-4587-a4f1-fec41cc5ecf2" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_3e15ecc3-1da0-4d0d-903d-55e680972b1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_3e15ecc3-1da0-4d0d-903d-55e680972b1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_3e15ecc3-1da0-4d0d-903d-55e680972b1b" xlink:to="loc_us-gaap_LossContingencyNatureDomain_3e15ecc3-1da0-4d0d-903d-55e680972b1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_67f6c36e-e508-4abe-acd6-7d70bd569412" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_3e15ecc3-1da0-4d0d-903d-55e680972b1b" xlink:to="loc_us-gaap_LossContingencyNatureDomain_67f6c36e-e508-4abe-acd6-7d70bd569412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_HostedExchangeIncidentMember_f3b20174-7c72-46c7-a88b-6995a557ade2" xlink:href="rxt-20231231.xsd#rxt_HostedExchangeIncidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_67f6c36e-e508-4abe-acd6-7d70bd569412" xlink:to="loc_rxt_HostedExchangeIncidentMember_f3b20174-7c72-46c7-a88b-6995a557ade2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndemnificationGuaranteeMember_71baec0a-8968-4b22-aedd-72d7d4f6b537" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndemnificationGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_67f6c36e-e508-4abe-acd6-7d70bd569412" xlink:to="loc_us-gaap_IndemnificationGuaranteeMember_71baec0a-8968-4b22-aedd-72d7d4f6b537" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_29670ba7-f2b8-4c1a-879c-5c5272afcf79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_38115d5a-46d3-4587-a4f1-fec41cc5ecf2" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_29670ba7-f2b8-4c1a-879c-5c5272afcf79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_29670ba7-f2b8-4c1a-879c-5c5272afcf79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_29670ba7-f2b8-4c1a-879c-5c5272afcf79" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_29670ba7-f2b8-4c1a-879c-5c5272afcf79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_0e8e4530-119b-4bd5-b4a0-b61f8a399b44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_29670ba7-f2b8-4c1a-879c-5c5272afcf79" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_0e8e4530-119b-4bd5-b4a0-b61f8a399b44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndemnificationGuaranteeMember_bdba6e72-c101-4f27-90b4-d04b78e7b245" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndemnificationGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_0e8e4530-119b-4bd5-b4a0-b61f8a399b44" xlink:to="loc_us-gaap_IndemnificationGuaranteeMember_bdba6e72-c101-4f27-90b4-d04b78e7b245" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyLossInPeriod_a6435816-3afe-44db-ab5a-2f425dc10c10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyLossInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:to="loc_us-gaap_LossContingencyLossInPeriod_a6435816-3afe-44db-ab5a-2f425dc10c10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyReceivableProceeds_b3dbc4b5-556a-4372-bcea-536e4bf2b5d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyReceivableProceeds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:to="loc_us-gaap_LossContingencyReceivableProceeds_b3dbc4b5-556a-4372-bcea-536e4bf2b5d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyReceivable_c1b72958-8c0c-4d0d-a928-787bc366c7f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:to="loc_us-gaap_LossContingencyReceivable_c1b72958-8c0c-4d0d-a928-787bc366c7f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_e5c8d132-4d76-47de-850f-9ba02840a513" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a629c42-bd9c-4a87-bd04-49101d8928f1" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_e5c8d132-4d76-47de-850f-9ba02840a513" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/July2021RestructuringPlanNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#July2021RestructuringPlanNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/July2021RestructuringPlanNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_dfbe592c-dbc1-4a10-bcd8-4001f8d7555f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3cf206e6-3b98-45d1-99ce-e2ef2f895af9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_dfbe592c-dbc1-4a10-bcd8-4001f8d7555f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3cf206e6-3b98-45d1-99ce-e2ef2f895af9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_5932abf5-bd44-4fdb-b801-2b0183dc4af6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3cf206e6-3b98-45d1-99ce-e2ef2f895af9" xlink:to="loc_us-gaap_RestructuringPlanAxis_5932abf5-bd44-4fdb-b801-2b0183dc4af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_5932abf5-bd44-4fdb-b801-2b0183dc4af6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_5932abf5-bd44-4fdb-b801-2b0183dc4af6" xlink:to="loc_us-gaap_RestructuringPlanDomain_5932abf5-bd44-4fdb-b801-2b0183dc4af6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_a2801910-78ef-4246-8a55-46b3f0b5054a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_5932abf5-bd44-4fdb-b801-2b0183dc4af6" xlink:to="loc_us-gaap_RestructuringPlanDomain_a2801910-78ef-4246-8a55-46b3f0b5054a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_July2021RestructuringPlanMember_9e646fcc-313f-4c43-8e91-00b7afca6859" xlink:href="rxt-20231231.xsd#rxt_July2021RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_a2801910-78ef-4246-8a55-46b3f0b5054a" xlink:to="loc_rxt_July2021RestructuringPlanMember_9e646fcc-313f-4c43-8e91-00b7afca6859" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_f0f40d16-3aa3-485d-9daa-c5968316f199" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3cf206e6-3b98-45d1-99ce-e2ef2f895af9" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_f0f40d16-3aa3-485d-9daa-c5968316f199" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f0f40d16-3aa3-485d-9daa-c5968316f199_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f0f40d16-3aa3-485d-9daa-c5968316f199" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f0f40d16-3aa3-485d-9daa-c5968316f199_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_363f66a2-9b93-4e1d-a520-382b81f06031" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f0f40d16-3aa3-485d-9daa-c5968316f199" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_363f66a2-9b93-4e1d-a520-382b81f06031" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_51837ba3-8223-49d5-b302-8b0f3aa2417f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_363f66a2-9b93-4e1d-a520-382b81f06031" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_51837ba3-8223-49d5-b302-8b0f3aa2417f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_f2322b4c-9d82-487e-ad73-44f26e2c6e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3cf206e6-3b98-45d1-99ce-e2ef2f895af9" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_f2322b4c-9d82-487e-ad73-44f26e2c6e4d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_f2322b4c-9d82-487e-ad73-44f26e2c6e4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_f2322b4c-9d82-487e-ad73-44f26e2c6e4d" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_f2322b4c-9d82-487e-ad73-44f26e2c6e4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_a839464a-5243-447e-81b9-aa35986e8172" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_f2322b4c-9d82-487e-ad73-44f26e2c6e4d" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_a839464a-5243-447e-81b9-aa35986e8172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AssetWriteOffsAndContractTerminationMember_d4cd2093-47b2-453e-b49b-7b95f18208d3" xlink:href="rxt-20231231.xsd#rxt_AssetWriteOffsAndContractTerminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a839464a-5243-447e-81b9-aa35986e8172" xlink:to="loc_rxt_AssetWriteOffsAndContractTerminationMember_d4cd2093-47b2-453e-b49b-7b95f18208d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_RestructuringAndRelatedCostsTerminationOfWorkforcePercentage_610b373c-286b-406e-8d55-2c34951fd44a" xlink:href="rxt-20231231.xsd#rxt_RestructuringAndRelatedCostsTerminationOfWorkforcePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_dfbe592c-dbc1-4a10-bcd8-4001f8d7555f" xlink:to="loc_rxt_RestructuringAndRelatedCostsTerminationOfWorkforcePercentage_610b373c-286b-406e-8d55-2c34951fd44a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_7c424c87-8270-4111-8fff-330ffdd198c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_dfbe592c-dbc1-4a10-bcd8-4001f8d7555f" xlink:to="loc_us-gaap_RestructuringCharges_7c424c87-8270-4111-8fff-330ffdd198c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_3d7cba7f-e640-4fc6-96da-03a9d1f570f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_dfbe592c-dbc1-4a10-bcd8-4001f8d7555f" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1_3d7cba7f-e640-4fc6-96da-03a9d1f570f7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/July2021RestructuringPlanRestructuringChargesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#July2021RestructuringPlanRestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/July2021RestructuringPlanRestructuringChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_b7cd4c94-34c5-4d8a-a5ea-4660cdbc88da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3ce2524d-7130-4a5e-8247-9aa772d3aac2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7cd4c94-34c5-4d8a-a5ea-4660cdbc88da" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3ce2524d-7130-4a5e-8247-9aa772d3aac2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_ec5331db-9c50-42aa-8bee-96733c442d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3ce2524d-7130-4a5e-8247-9aa772d3aac2" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_ec5331db-9c50-42aa-8bee-96733c442d4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_ec5331db-9c50-42aa-8bee-96733c442d4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ec5331db-9c50-42aa-8bee-96733c442d4f" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_ec5331db-9c50-42aa-8bee-96733c442d4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_03752154-5a67-40c4-99a8-0a8ab265dac7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_ec5331db-9c50-42aa-8bee-96733c442d4f" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_03752154-5a67-40c4-99a8-0a8ab265dac7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_24d80bfd-e823-410a-b678-84c9be0b6e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_03752154-5a67-40c4-99a8-0a8ab265dac7" xlink:to="loc_us-gaap_EmployeeSeveranceMember_24d80bfd-e823-410a-b678-84c9be0b6e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_c384472e-2a4b-4cdc-a33f-3fb7af7a8012" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_03752154-5a67-40c4-99a8-0a8ab265dac7" xlink:to="loc_us-gaap_OtherRestructuringMember_c384472e-2a4b-4cdc-a33f-3fb7af7a8012" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_5a767729-1871-418d-ae3b-592afb0f3639" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3ce2524d-7130-4a5e-8247-9aa772d3aac2" xlink:to="loc_us-gaap_RestructuringPlanAxis_5a767729-1871-418d-ae3b-592afb0f3639" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_5a767729-1871-418d-ae3b-592afb0f3639_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_5a767729-1871-418d-ae3b-592afb0f3639" xlink:to="loc_us-gaap_RestructuringPlanDomain_5a767729-1871-418d-ae3b-592afb0f3639_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_f43e7c58-5bc7-4148-90e6-865db8d0d0d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_5a767729-1871-418d-ae3b-592afb0f3639" xlink:to="loc_us-gaap_RestructuringPlanDomain_f43e7c58-5bc7-4148-90e6-865db8d0d0d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_July2021RestructuringPlanMember_fd6f73b7-24f2-451c-a623-ceac2c9ea489" xlink:href="rxt-20231231.xsd#rxt_July2021RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_f43e7c58-5bc7-4148-90e6-865db8d0d0d4" xlink:to="loc_rxt_July2021RestructuringPlanMember_fd6f73b7-24f2-451c-a623-ceac2c9ea489" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_e70d32e3-1892-4f18-bf32-621ed7645de8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3ce2524d-7130-4a5e-8247-9aa772d3aac2" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_e70d32e3-1892-4f18-bf32-621ed7645de8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_e70d32e3-1892-4f18-bf32-621ed7645de8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_e70d32e3-1892-4f18-bf32-621ed7645de8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_e70d32e3-1892-4f18-bf32-621ed7645de8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_848f60ba-ebfc-42cc-aee5-1bab157f0bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_e70d32e3-1892-4f18-bf32-621ed7645de8" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_848f60ba-ebfc-42cc-aee5-1bab157f0bdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7153415d-8bf0-4fac-91fd-d9da1d048f8b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_848f60ba-ebfc-42cc-aee5-1bab157f0bdf" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7153415d-8bf0-4fac-91fd-d9da1d048f8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_f48fa66b-4f4a-4b43-aed6-4d6bd0b9321e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b7cd4c94-34c5-4d8a-a5ea-4660cdbc88da" xlink:to="loc_us-gaap_RestructuringCharges_f48fa66b-4f4a-4b43-aed6-4d6bd0b9321e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/July2021RestructuringPlanRestructuringReservesbyTypeofCostDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#July2021RestructuringPlanRestructuringReservesbyTypeofCostDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/July2021RestructuringPlanRestructuringReservesbyTypeofCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_2fdc4587-e516-4761-aba1-7ff6c214f02e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_45df2701-6c8e-4007-a01f-2ecec90de667" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2fdc4587-e516-4761-aba1-7ff6c214f02e" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_45df2701-6c8e-4007-a01f-2ecec90de667" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_1f84ef61-c7af-4918-8831-5ee9d0f289fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_45df2701-6c8e-4007-a01f-2ecec90de667" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_1f84ef61-c7af-4918-8831-5ee9d0f289fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_1f84ef61-c7af-4918-8831-5ee9d0f289fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_1f84ef61-c7af-4918-8831-5ee9d0f289fb" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_1f84ef61-c7af-4918-8831-5ee9d0f289fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3bcc07bb-a4f5-448d-bf30-301451702863" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_1f84ef61-c7af-4918-8831-5ee9d0f289fb" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3bcc07bb-a4f5-448d-bf30-301451702863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_5183a24a-0f7a-4b0d-9c11-3adabe390194" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3bcc07bb-a4f5-448d-bf30-301451702863" xlink:to="loc_us-gaap_EmployeeSeveranceMember_5183a24a-0f7a-4b0d-9c11-3adabe390194" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_5ddbc1e3-0412-428a-b035-90e93a6cf2c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3bcc07bb-a4f5-448d-bf30-301451702863" xlink:to="loc_us-gaap_OtherRestructuringMember_5ddbc1e3-0412-428a-b035-90e93a6cf2c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_45df144a-a6c2-4478-bbc4-e38c06d9ce2e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_45df2701-6c8e-4007-a01f-2ecec90de667" xlink:to="loc_us-gaap_RestructuringPlanAxis_45df144a-a6c2-4478-bbc4-e38c06d9ce2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_45df144a-a6c2-4478-bbc4-e38c06d9ce2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_45df144a-a6c2-4478-bbc4-e38c06d9ce2e" xlink:to="loc_us-gaap_RestructuringPlanDomain_45df144a-a6c2-4478-bbc4-e38c06d9ce2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_2dbaa671-31b8-4cf6-a713-c7f839efcd86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_45df144a-a6c2-4478-bbc4-e38c06d9ce2e" xlink:to="loc_us-gaap_RestructuringPlanDomain_2dbaa671-31b8-4cf6-a713-c7f839efcd86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_July2021RestructuringPlanMember_503dc596-aa93-4170-beda-8d33d9235966" xlink:href="rxt-20231231.xsd#rxt_July2021RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_2dbaa671-31b8-4cf6-a713-c7f839efcd86" xlink:to="loc_rxt_July2021RestructuringPlanMember_503dc596-aa93-4170-beda-8d33d9235966" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_a88f4bb4-7dba-4a34-bf08-32e4717bd6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2fdc4587-e516-4761-aba1-7ff6c214f02e" xlink:to="loc_us-gaap_RestructuringReserveRollForward_a88f4bb4-7dba-4a34-bf08-32e4717bd6fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_783863fb-1204-4643-82e3-1ca5c33ad4f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_a88f4bb4-7dba-4a34-bf08-32e4717bd6fe" xlink:to="loc_us-gaap_RestructuringReserve_783863fb-1204-4643-82e3-1ca5c33ad4f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_64ae77fe-a3ea-4f22-89f7-1f419a0c64a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_a88f4bb4-7dba-4a34-bf08-32e4717bd6fe" xlink:to="loc_us-gaap_RestructuringCharges_64ae77fe-a3ea-4f22-89f7-1f419a0c64a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_9c226e2d-3822-4a08-898e-1f9550423563" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_a88f4bb4-7dba-4a34-bf08-32e4717bd6fe" xlink:to="loc_us-gaap_PaymentsForRestructuring_9c226e2d-3822-4a08-898e-1f9550423563" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_c5af528c-bf70-4d89-93d2-b798956b5edb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_ac9519c4-a6a6-48d9-b2ea-57e3958726a6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2fdc4587-e516-4761-aba1-7ff6c214f02e" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_ac9519c4-a6a6-48d9-b2ea-57e3958726a6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/StockholdersEquityDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#StockholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/StockholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_8cbd3d3b-afd6-4171-ac43-5f282550c20e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_8cbd3d3b-afd6-4171-ac43-5f282550c20e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_1fa9c42b-16fc-4282-8dcb-d11e427b46b2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8cbd3d3b-afd6-4171-ac43-5f282550c20e" xlink:to="loc_srt_RangeAxis_1fa9c42b-16fc-4282-8dcb-d11e427b46b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1fa9c42b-16fc-4282-8dcb-d11e427b46b2_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_1fa9c42b-16fc-4282-8dcb-d11e427b46b2" xlink:to="loc_srt_RangeMember_1fa9c42b-16fc-4282-8dcb-d11e427b46b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b606b989-2a82-4bc4-809d-4a637ab1354a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_1fa9c42b-16fc-4282-8dcb-d11e427b46b2" xlink:to="loc_srt_RangeMember_b606b989-2a82-4bc4-809d-4a637ab1354a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c2fb1e60-4d34-4e91-96c6-e4cec38c3f54" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b606b989-2a82-4bc4-809d-4a637ab1354a" xlink:to="loc_srt_MaximumMember_c2fb1e60-4d34-4e91-96c6-e4cec38c3f54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_052d09cf-1e32-43f1-b928-5eb622696992" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8cbd3d3b-afd6-4171-ac43-5f282550c20e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_052d09cf-1e32-43f1-b928-5eb622696992" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_052d09cf-1e32-43f1-b928-5eb622696992_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_052d09cf-1e32-43f1-b928-5eb622696992" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_052d09cf-1e32-43f1-b928-5eb622696992_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31d653f7-c4fd-45bc-880b-0a9e5cded65b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_052d09cf-1e32-43f1-b928-5eb622696992" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31d653f7-c4fd-45bc-880b-0a9e5cded65b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DataPipeMember_9c60c9db-daf6-4c23-b98f-b54e04f273bd" xlink:href="rxt-20231231.xsd#rxt_DataPipeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_31d653f7-c4fd-45bc-880b-0a9e5cded65b" xlink:to="loc_rxt_DataPipeMember_9c60c9db-daf6-4c23-b98f-b54e04f273bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_d24d858e-1e17-4303-8d3e-29dc92bcb2ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_CommonStockSharesIssued_d24d858e-1e17-4303-8d3e-29dc92bcb2ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_68f16628-010c-46ae-8479-de06a3a2143b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_68f16628-010c-46ae-8479-de06a3a2143b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_NumberOfCommonStockClasses_2cd31387-5fa2-4741-a612-6f910d8a0e4d" xlink:href="rxt-20231231.xsd#rxt_NumberOfCommonStockClasses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_NumberOfCommonStockClasses_2cd31387-5fa2-4741-a612-6f910d8a0e4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CommonStockVotesPerShare_ca84008f-b15d-41eb-9e31-ffc1dce34e10" xlink:href="rxt-20231231.xsd#rxt_CommonStockVotesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_CommonStockVotesPerShare_ca84008f-b15d-41eb-9e31-ffc1dce34e10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_3b1748bc-3519-4609-99ea-b68b7e9af6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_3b1748bc-3519-4609-99ea-b68b7e9af6b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_43314336-e679-4658-8218-88ae5fc7263d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_43314336-e679-4658-8218-88ae5fc7263d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_05fcbbdd-7819-4be4-91f3-7d1c92003c43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_PreferredStockSharesIssued_05fcbbdd-7819-4be4-91f3-7d1c92003c43" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_98b711a0-f7b2-4f9f-a4eb-84337afed5f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_98b711a0-f7b2-4f9f-a4eb-84337afed5f3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_fa1f741e-7d09-494f-b633-7f80b8c55882" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_fa1f741e-7d09-494f-b633-7f80b8c55882" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_649527d9-f834-4d86-9459-4a05ee5e3113" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_649527d9-f834-4d86-9459-4a05ee5e3113" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8058e267-642c-462b-bd60-9496d626af37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8058e267-642c-462b-bd60-9496d626af37" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_7cb93489-eabe-491c-afbb-23af3ce04de9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_7cb93489-eabe-491c-afbb-23af3ce04de9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityMultipleOnInvestedCapitalMaximum_ab04f1e8-5756-4a91-b104-44eadbd804ed" xlink:href="rxt-20231231.xsd#rxt_BusinessAcquisitionContingentConsiderationLiabilityMultipleOnInvestedCapitalMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityMultipleOnInvestedCapitalMaximum_ab04f1e8-5756-4a91-b104-44eadbd804ed" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdTradingDays_09248db9-9648-4cc6-9d49-c3fe980a3dbd" xlink:href="rxt-20231231.xsd#rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdTradingDays_09248db9-9648-4cc6-9d49-c3fe980a3dbd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdStockPrice_28390484-34c3-4015-ab41-6a56d93eed9f" xlink:href="rxt-20231231.xsd#rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdStockPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityThresholdStockPrice_28390484-34c3-4015-ab41-6a56d93eed9f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityAdditionalSharesIssuable_b395c694-1b2a-4a69-8ca6-6b294bf284a4" xlink:href="rxt-20231231.xsd#rxt_BusinessAcquisitionContingentConsiderationLiabilityAdditionalSharesIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_b94ef120-db63-4c87-ad60-ad9c50410e95" xlink:to="loc_rxt_BusinessAcquisitionContingentConsiderationLiabilityAdditionalSharesIssuable_b395c694-1b2a-4a69-8ca6-6b294bf284a4" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:to="loc_us-gaap_PlanNameAxis_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4" xlink:to="loc_us-gaap_PlanNameDomain_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_13afcfd4-9f34-4970-a0cd-90095115d446" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e00096f9-5d92-4a6b-8ef1-5ac3286d18a4" xlink:to="loc_us-gaap_PlanNameDomain_13afcfd4-9f34-4970-a0cd-90095115d446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A2017IncentivePlanMember_9906523d-25ae-41dd-b370-73c261c2535e" xlink:href="rxt-20231231.xsd#rxt_A2017IncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_13afcfd4-9f34-4970-a0cd-90095115d446" xlink:to="loc_rxt_A2017IncentivePlanMember_9906523d-25ae-41dd-b370-73c261c2535e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A2020IncentivePlanMember_db911d65-46a4-4700-8bc3-613453dab90f" xlink:href="rxt-20231231.xsd#rxt_A2020IncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_13afcfd4-9f34-4970-a0cd-90095115d446" xlink:to="loc_rxt_A2020IncentivePlanMember_db911d65-46a4-4700-8bc3-613453dab90f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_EmployeeStockPurchasePlanMember_f95726e1-e976-443c-bdf6-eb91017234a3" xlink:href="rxt-20231231.xsd#rxt_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_13afcfd4-9f34-4970-a0cd-90095115d446" xlink:to="loc_rxt_EmployeeStockPurchasePlanMember_f95726e1-e976-443c-bdf6-eb91017234a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_162ac420-6810-4290-adf8-c8115bae1f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:to="loc_us-gaap_AwardTypeAxis_162ac420-6810-4290-adf8-c8115bae1f3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162ac420-6810-4290-adf8-c8115bae1f3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_162ac420-6810-4290-adf8-c8115bae1f3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162ac420-6810-4290-adf8-c8115bae1f3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_162ac420-6810-4290-adf8-c8115bae1f3b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_8aaacb5e-571a-4729-baa3-0a51438c6bab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_EmployeeStockOptionMember_8aaacb5e-571a-4729-baa3-0a51438c6bab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_a0be7eda-8c3c-48a5-88b3-6910857b010d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_a0be7eda-8c3c-48a5-88b3-6910857b010d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_924a6cf4-245f-458b-b36e-28fc0bfa12b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_RestrictedStockMember_924a6cf4-245f-458b-b36e-28fc0bfa12b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_53733eb3-a363-4a99-9a5d-63921e5295a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_PerformanceSharesMember_53733eb3-a363-4a99-9a5d-63921e5295a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_591228d2-6a31-4602-891a-b8b3c106b3a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_591228d2-6a31-4602-891a-b8b3c106b3a5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_LongTermIncentiveCashUnitsMember_36de57e5-d805-4a14-a017-35cafe458c84" xlink:href="rxt-20231231.xsd#rxt_LongTermIncentiveCashUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_rxt_LongTermIncentiveCashUnitsMember_36de57e5-d805-4a14-a017-35cafe458c84" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_198a0c61-82e7-4326-ad5a-9555f87de50a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_162caa3c-4638-43ca-9c07-3abb44d4775d" xlink:to="loc_us-gaap_EmployeeStockMember_198a0c61-82e7-4326-ad5a-9555f87de50a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_fd349285-abfe-4002-b638-98ead8838b0f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:to="loc_srt_TitleOfIndividualAxis_fd349285-abfe-4002-b638-98ead8838b0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd349285-abfe-4002-b638-98ead8838b0f_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_fd349285-abfe-4002-b638-98ead8838b0f" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd349285-abfe-4002-b638-98ead8838b0f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ff7d5ce0-bf3a-4cb0-9916-51bf1a64f1f6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_fd349285-abfe-4002-b638-98ead8838b0f" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ff7d5ce0-bf3a-4cb0-9916-51bf1a64f1f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_0a204613-b419-4e66-90e7-d5418b92eb02" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ff7d5ce0-bf3a-4cb0-9916-51bf1a64f1f6" xlink:to="loc_srt_ExecutiveOfficerMember_0a204613-b419-4e66-90e7-d5418b92eb02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_7d20fdba-5512-4203-abe9-b95e483e8003" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_DirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_ff7d5ce0-bf3a-4cb0-9916-51bf1a64f1f6" xlink:to="loc_srt_DirectorMember_7d20fdba-5512-4203-abe9-b95e483e8003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_69e52121-eadd-49bb-adb0-52e26cc0bdcc" xlink:to="loc_srt_RangeAxis_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a" xlink:to="loc_srt_RangeMember_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3368a5d5-1f7e-46a8-a776-cab28363e69b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2d20035f-e0db-4a1b-a4cd-d32991ae1f9a" xlink:to="loc_srt_RangeMember_3368a5d5-1f7e-46a8-a776-cab28363e69b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_458b3bb4-ce41-497b-95f4-d7a636f0feb9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3368a5d5-1f7e-46a8-a776-cab28363e69b" xlink:to="loc_srt_MinimumMember_458b3bb4-ce41-497b-95f4-d7a636f0feb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_127193c5-272f-4897-bc35-00f7dc6906a7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3368a5d5-1f7e-46a8-a776-cab28363e69b" xlink:to="loc_srt_MaximumMember_127193c5-272f-4897-bc35-00f7dc6906a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_f68fa0fa-7ed4-4e49-95dc-3b8feab75c19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_f68fa0fa-7ed4-4e49-95dc-3b8feab75c19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOutstanding_fc8822f1-f233-43b9-9018-33a531b77979" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOutstanding_fc8822f1-f233-43b9-9018-33a531b77979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b262d527-9bb7-408a-a040-c1c3d2cf5335" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b262d527-9bb7-408a-a040-c1c3d2cf5335" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_7675db23-3773-4f7c-a4c6-8c25861f3de4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_7675db23-3773-4f7c-a4c6-8c25861f3de4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_633548a4-93ae-402a-b2ff-d797f97186db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_633548a4-93ae-402a-b2ff-d797f97186db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_8a7fe8be-2e1d-472e-ac61-a3fe8be6a613" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_8a7fe8be-2e1d-472e-ac61-a3fe8be6a613" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_1121b5ee-428f-47bb-8309-cbad743f8658" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_1121b5ee-428f-47bb-8309-cbad743f8658" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a6331057-81b0-43a7-bf34-8e9bc7e93919" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a6331057-81b0-43a7-bf34-8e9bc7e93919" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_737ffb18-ba74-4313-a028-6c35afea4a95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_737ffb18-ba74-4313-a028-6c35afea4a95" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_6ae1b5e7-3b03-4420-9898-3e57f189c429" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_6ae1b5e7-3b03-4420-9898-3e57f189c429" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardLagPeriodInQuarters_7f4a4429-c3d7-4a73-b2a2-0b87abdac66b" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardLagPeriodInQuarters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardLagPeriodInQuarters_7f4a4429-c3d7-4a73-b2a2-0b87abdac66b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9156fad4-b37a-44e5-8cdc-7a5f9d2155ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9156fad4-b37a-44e5-8cdc-7a5f9d2155ca" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_22a621c9-7217-48ec-8825-39c4cd5395d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_22a621c9-7217-48ec-8825-39c4cd5395d5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueReleased_09c30f71-7ed1-4d18-b33f-83f1dc4bf771" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueReleased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueReleased_09c30f71-7ed1-4d18-b33f-83f1dc4bf771" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_583231b0-583a-4516-8542-16dfdd97546e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_583231b0-583a-4516-8542-16dfdd97546e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1e84efcc-e798-48c0-8780-d4778926c908" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1e84efcc-e798-48c0-8780-d4778926c908" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_61f4752f-4465-4c4a-897a-2cded1bbeba2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_61f4752f-4465-4c4a-897a-2cded1bbeba2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_0abeaf4f-5f0f-49a4-8474-570c076cf2f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_0abeaf4f-5f0f-49a4-8474-570c076cf2f4" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_d191de21-29a5-44a0-9460-e868bd30482c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_d191de21-29a5-44a0-9460-e868bd30482c" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_731cc4e3-51fd-458e-bbe3-d090802bbea7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7c14f073-85bc-4213-abd5-5f17124c9a42" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_731cc4e3-51fd-458e-bbe3-d090802bbea7" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansEquityAwardsOutstandingDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansEquityAwardsOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansEquityAwardsOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e97ba705-13b1-47d4-8856-881cae2f113d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8a2ee774-13ab-4683-ac3b-a6c3b10bb5df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e97ba705-13b1-47d4-8856-881cae2f113d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8a2ee774-13ab-4683-ac3b-a6c3b10bb5df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_76e8201a-d0cf-49fd-af52-fd91594ce12f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8a2ee774-13ab-4683-ac3b-a6c3b10bb5df" xlink:to="loc_us-gaap_AwardTypeAxis_76e8201a-d0cf-49fd-af52-fd91594ce12f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76e8201a-d0cf-49fd-af52-fd91594ce12f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_76e8201a-d0cf-49fd-af52-fd91594ce12f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76e8201a-d0cf-49fd-af52-fd91594ce12f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91478861-a4b0-4715-966b-6d6ac0301242" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_76e8201a-d0cf-49fd-af52-fd91594ce12f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91478861-a4b0-4715-966b-6d6ac0301242" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_820b9e87-1fd8-46b1-a199-e6f631a3d471" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91478861-a4b0-4715-966b-6d6ac0301242" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_820b9e87-1fd8-46b1-a199-e6f631a3d471" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1e4223c1-c000-4517-be43-902009a931fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91478861-a4b0-4715-966b-6d6ac0301242" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1e4223c1-c000-4517-be43-902009a931fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_76ae56d2-dc9f-4246-945e-0286df98c450" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e97ba705-13b1-47d4-8856-881cae2f113d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_76ae56d2-dc9f-4246-945e-0286df98c450" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_caf911d1-fe64-40d4-87a8-ffa267f3c45f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e97ba705-13b1-47d4-8856-881cae2f113d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_caf911d1-fe64-40d4-87a8-ffa267f3c45f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndEquityInstrumentsOtherThanOptionsOutstandingNumber_a131efa4-4209-40d3-97f3-412abcb41ee8" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndEquityInstrumentsOtherThanOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e97ba705-13b1-47d4-8856-881cae2f113d" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndEquityInstrumentsOtherThanOptionsOutstandingNumber_a131efa4-4209-40d3-97f3-412abcb41ee8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansStockOptionActivityDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansStockOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansStockOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d8ca78c-562f-4b57-8ea9-9f989deecbac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d8ca78c-562f-4b57-8ea9-9f989deecbac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_49d4085c-51c5-4429-9162-6b3bc0183d22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0d8ca78c-562f-4b57-8ea9-9f989deecbac" xlink:to="loc_us-gaap_AwardTypeAxis_49d4085c-51c5-4429-9162-6b3bc0183d22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_49d4085c-51c5-4429-9162-6b3bc0183d22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_49d4085c-51c5-4429-9162-6b3bc0183d22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_49d4085c-51c5-4429-9162-6b3bc0183d22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fc71c5f3-bf85-48b3-b744-c7be132b41c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_49d4085c-51c5-4429-9162-6b3bc0183d22" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fc71c5f3-bf85-48b3-b744-c7be132b41c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_7c46f89f-772e-48a7-a84d-c1b7d254f7a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fc71c5f3-bf85-48b3-b744-c7be132b41c3" xlink:to="loc_us-gaap_EmployeeStockOptionMember_7c46f89f-772e-48a7-a84d-c1b7d254f7a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_060584b0-7a80-433a-808c-d3413b03ede0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_060584b0-7a80-433a-808c-d3413b03ede0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c8fed232-ac41-4c2c-b4b6-0e6faca6c8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c8fed232-ac41-4c2c-b4b6-0e6faca6c8f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_aa74a00c-df29-4c52-b174-de8d5a895001" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_aa74a00c-df29-4c52-b174-de8d5a895001" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_40f13434-e8f1-45f5-bb42-9cd5416e1f22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_40f13434-e8f1-45f5-bb42-9cd5416e1f22" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_9289e12c-b227-4167-a904-8728062d9f65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_8113f7ea-9e19-41f4-b4ec-56606c6e4da6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_9289e12c-b227-4167-a904-8728062d9f65" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_8d631afc-2179-44cb-90b2-9bcfc2295912" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_c0482e73-6a31-499d-8d28-0614110d27b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_c0482e73-6a31-499d-8d28-0614110d27b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_0fd4f207-f945-4a22-9296-9f94b1943e75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_0fd4f207-f945-4a22-9296-9f94b1943e75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_bf334eec-cea9-4e78-8f8c-33c794500223" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_bf334eec-cea9-4e78-8f8c-33c794500223" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_26565876-e6b0-46f8-9c90-75ad8066c58a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_26565876-e6b0-46f8-9c90-75ad8066c58a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_f65d293e-0cab-4219-82ce-5f5744732629" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_f65d293e-0cab-4219-82ce-5f5744732629" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_99b1400c-d239-4c15-9f8f-85c215dd2452" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_99b1400c-d239-4c15-9f8f-85c215dd2452" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_d781c669-1970-4141-84dc-f9d26d6cda73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_bbe87d27-7284-4f62-848f-f3c3370f6f38" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_d781c669-1970-4141-84dc-f9d26d6cda73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8eb625e9-ec79-4e89-843b-9ee6d3cec613" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_37ca6581-4960-42b0-ac78-77641ccded4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_37ca6581-4960-42b0-ac78-77641ccded4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_0edce11f-25a9-4f93-b407-77c955896550" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_0edce11f-25a9-4f93-b407-77c955896550" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f5df1fcd-44d1-4189-add1-8c5f68c8ee26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_77c658a8-2b36-4499-be3e-0c3dc9556d50" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_77c658a8-2b36-4499-be3e-0c3dc9556d50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_1fc925d4-ee7f-47c6-8047-389e93148f41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_1fc925d4-ee7f-47c6-8047-389e93148f41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_d41cb3f7-e266-4e13-a943-314108ff80b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_d41cb3f7-e266-4e13-a943-314108ff80b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_883ba092-134a-4042-bc27-ebcf2c4b5d09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_883ba092-134a-4042-bc27-ebcf2c4b5d09" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_a0bc94ec-2fbe-4e90-b42e-cc15d65f7388" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_a0bc94ec-2fbe-4e90-b42e-cc15d65f7388" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_b554f6fb-adcd-4c93-93dc-384bd39f1d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_0fee740b-dfe4-4b5b-9440-814b7a1eccae" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_b554f6fb-adcd-4c93-93dc-384bd39f1d9c" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansFairValueAssumptionsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansFairValueAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansFairValueAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8cf2a5c8-6975-477a-b7b1-658f02abeda7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8cf2a5c8-6975-477a-b7b1-658f02abeda7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_12a967cb-5e3f-4926-885d-99d472cad89c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8cf2a5c8-6975-477a-b7b1-658f02abeda7" xlink:to="loc_srt_RangeAxis_12a967cb-5e3f-4926-885d-99d472cad89c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_12a967cb-5e3f-4926-885d-99d472cad89c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_12a967cb-5e3f-4926-885d-99d472cad89c" xlink:to="loc_srt_RangeMember_12a967cb-5e3f-4926-885d-99d472cad89c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_30af16e7-57c1-4758-8a11-d57f3f97be9e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_12a967cb-5e3f-4926-885d-99d472cad89c" xlink:to="loc_srt_RangeMember_30af16e7-57c1-4758-8a11-d57f3f97be9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_cac727e9-eec5-4240-b649-d7b29488b184" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_30af16e7-57c1-4758-8a11-d57f3f97be9e" xlink:to="loc_srt_MinimumMember_cac727e9-eec5-4240-b649-d7b29488b184" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1ef5db5d-8eac-433b-be73-738778f3d6af" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_30af16e7-57c1-4758-8a11-d57f3f97be9e" xlink:to="loc_srt_MaximumMember_1ef5db5d-8eac-433b-be73-738778f3d6af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3ea39944-1790-4211-a927-f307a6052dc3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8cf2a5c8-6975-477a-b7b1-658f02abeda7" xlink:to="loc_us-gaap_AwardTypeAxis_3ea39944-1790-4211-a927-f307a6052dc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3ea39944-1790-4211-a927-f307a6052dc3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3ea39944-1790-4211-a927-f307a6052dc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3ea39944-1790-4211-a927-f307a6052dc3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40f23cd2-d6e8-4d42-8500-f7ff873e5d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3ea39944-1790-4211-a927-f307a6052dc3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40f23cd2-d6e8-4d42-8500-f7ff873e5d0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_cc886db2-d949-40d8-a503-e52960b4eba7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_40f23cd2-d6e8-4d42-8500-f7ff873e5d0f" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_cc886db2-d949-40d8-a503-e52960b4eba7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_2d39042f-3b88-4604-b4cf-d4787fede2e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_2d39042f-3b88-4604-b4cf-d4787fede2e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_7c7456ff-bf36-4e6d-acc0-29b0a147ddba" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_7c7456ff-bf36-4e6d-acc0-29b0a147ddba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_cc29a420-8d9f-4f06-b828-ae620f4a7033" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_cc29a420-8d9f-4f06-b828-ae620f4a7033" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_262ab6f4-5181-4aa8-8090-0fbbe1c6ac7b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_262ab6f4-5181-4aa8-8090-0fbbe1c6ac7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_e005e8f5-a4dd-4e6f-938b-25d9aca81323" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e06ebee4-ca92-4f01-a869-dd02633c0d03" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_e005e8f5-a4dd-4e6f-938b-25d9aca81323" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansRestrictedStockActivityDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansRestrictedStockActivityDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b458709b-3a89-44ff-812f-696c37f21f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b458709b-3a89-44ff-812f-696c37f21f1a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_d3fb7198-911b-485e-baa3-e261d9f68d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b458709b-3a89-44ff-812f-696c37f21f1a" xlink:to="loc_us-gaap_AwardTypeAxis_d3fb7198-911b-485e-baa3-e261d9f68d5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d3fb7198-911b-485e-baa3-e261d9f68d5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_d3fb7198-911b-485e-baa3-e261d9f68d5c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d3fb7198-911b-485e-baa3-e261d9f68d5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d62a52c-febd-4b55-8b07-c0f5ca70b374" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_d3fb7198-911b-485e-baa3-e261d9f68d5c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d62a52c-febd-4b55-8b07-c0f5ca70b374" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_26b60ca6-ce6f-4d17-8da9-a4402bdd4c48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d62a52c-febd-4b55-8b07-c0f5ca70b374" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_26b60ca6-ce6f-4d17-8da9-a4402bdd4c48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3bb8a430-5615-487e-a776-ebc91235ce66" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3bb8a430-5615-487e-a776-ebc91235ce66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3a6d57eb-236a-4e7d-838f-17ab4692e7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3a6d57eb-236a-4e7d-838f-17ab4692e7d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedInPeriod_0f44073c-c139-4264-9208-684173ab70ec" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedInPeriod_0f44073c-c139-4264-9208-684173ab70ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_e7bed074-4fe6-4492-b905-5ff8b59964e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7f749907-a3f5-4732-aa30-3021451bcb69" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_e7bed074-4fe6-4492-b905-5ff8b59964e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_49d7e7a7-9216-485d-9b1a-0e0436c6ff8f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentExpectedToVest_34d7f98b-7464-472c-a74a-5f47a66059b1" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentExpectedToVest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentExpectedToVest_34d7f98b-7464-472c-a74a-5f47a66059b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7a1877fd-a174-4e39-9284-face3781de0b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7a1877fd-a174-4e39-9284-face3781de0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_66b858d3-f357-418c-9dea-892f8e02051c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_66b858d3-f357-418c-9dea-892f8e02051c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedWeightedAverageGrantDateFairValue_6cb53ae6-b56e-4b4a-9192-9a28e0e3a705" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedWeightedAverageGrantDateFairValue_6cb53ae6-b56e-4b4a-9192-9a28e0e3a705" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_85362101-580a-4e72-880e-ee58f41eb5b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_50051b6c-676c-4ee6-b793-c26bca181f1d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_85362101-580a-4e72-880e-ee58f41eb5b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_39383919-aa48-4e10-bc2e-4fae7c5fd366" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_4ba28598-f5ff-45cb-98c8-4771a429993d" xlink:href="rxt-20231231.xsd#rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c83c3b79-670f-4527-be51-e6d934389e60" xlink:to="loc_rxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_4ba28598-f5ff-45cb-98c8-4771a429993d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansScheduleofShareBasedCompensationExpenseEquityandLiabilityAwardsAmountsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansScheduleofShareBasedCompensationExpenseEquityandLiabilityAwardsAmountsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansScheduleofShareBasedCompensationExpenseEquityandLiabilityAwardsAmountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f74ee8b6-3c3c-4fb6-870a-8a88c05c4d71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5fce7783-a8ca-4762-9532-e8956953f5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f74ee8b6-3c3c-4fb6-870a-8a88c05c4d71" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5fce7783-a8ca-4762-9532-e8956953f5bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5fce7783-a8ca-4762-9532-e8956953f5bd" xlink:to="loc_us-gaap_AwardTypeAxis_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddb0d8eb-6e86-4394-94f2-098c18b848d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3ba1e8ae-3cc4-44d4-a346-4c86c1a8cd2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddb0d8eb-6e86-4394-94f2-098c18b848d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_EquityClassifiedAwardsMember_16edeb20-d3a8-44ec-ae17-bf4e8de50768" xlink:href="rxt-20231231.xsd#rxt_EquityClassifiedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddb0d8eb-6e86-4394-94f2-098c18b848d9" xlink:to="loc_rxt_EquityClassifiedAwardsMember_16edeb20-d3a8-44ec-ae17-bf4e8de50768" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_LiabilityClassifiedAwardsMember_914f5a48-541d-4f3a-b3c7-90554ca328a3" xlink:href="rxt-20231231.xsd#rxt_LiabilityClassifiedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddb0d8eb-6e86-4394-94f2-098c18b848d9" xlink:to="loc_rxt_LiabilityClassifiedAwardsMember_914f5a48-541d-4f3a-b3c7-90554ca328a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_0f061ce6-8b94-4ac4-a04b-eb3ac0228c32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f74ee8b6-3c3c-4fb6-870a-8a88c05c4d71" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_0f061ce6-8b94-4ac4-a04b-eb3ac0228c32" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansSharebasedCompensationExpenseRecognizedDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#ShareBasedCompensationandEmployeeBenefitPlansSharebasedCompensationExpenseRecognizedDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/ShareBasedCompensationandEmployeeBenefitPlansSharebasedCompensationExpenseRecognizedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654fa412-5230-4457-ac3b-8aa0b46620df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65390c7f-135c-4ec5-aa90-d410b3110063" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654fa412-5230-4457-ac3b-8aa0b46620df" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65390c7f-135c-4ec5-aa90-d410b3110063" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_5d3356eb-edfd-40be-822f-5085f700d86c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_65390c7f-135c-4ec5-aa90-d410b3110063" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_5d3356eb-edfd-40be-822f-5085f700d86c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5d3356eb-edfd-40be-822f-5085f700d86c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5d3356eb-edfd-40be-822f-5085f700d86c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5d3356eb-edfd-40be-822f-5085f700d86c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_e8bc0fb8-1ac0-4159-9bc0-97adaff640f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5d3356eb-edfd-40be-822f-5085f700d86c" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_e8bc0fb8-1ac0-4159-9bc0-97adaff640f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_441278dd-1196-4246-a060-a7cb7a7b198e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_e8bc0fb8-1ac0-4159-9bc0-97adaff640f1" xlink:to="loc_us-gaap_CostOfSalesMember_441278dd-1196-4246-a060-a7cb7a7b198e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_f7a5f58d-2139-4f7c-b7be-3128ead752df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_e8bc0fb8-1ac0-4159-9bc0-97adaff640f1" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_f7a5f58d-2139-4f7c-b7be-3128ead752df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_9590de8d-3650-49a6-a7bc-4f4a3d2b82b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654fa412-5230-4457-ac3b-8aa0b46620df" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_9590de8d-3650-49a6-a7bc-4f4a3d2b82b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_dc513ce4-016b-455d-908f-ae9b1b480c80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654fa412-5230-4457-ac3b-8aa0b46620df" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_dc513ce4-016b-455d-908f-ae9b1b480c80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_28839a9c-ffbc-4cd4-8d80-15a09216b737" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654fa412-5230-4457-ac3b-8aa0b46620df" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_28839a9c-ffbc-4cd4-8d80-15a09216b737" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/TaxesLossBeforeIncomeTaxesDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#TaxesLossBeforeIncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/TaxesLossBeforeIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_d6fa57d2-f145-4360-b7e0-3ce103bb2cf4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_3fde2e4f-2fee-4f4a-8aff-64b920446b48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_d6fa57d2-f145-4360-b7e0-3ce103bb2cf4" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_3fde2e4f-2fee-4f4a-8aff-64b920446b48" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_200e68f5-6155-432f-9c73-e1bad1c55a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_3fde2e4f-2fee-4f4a-8aff-64b920446b48" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_200e68f5-6155-432f-9c73-e1bad1c55a4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_200e68f5-6155-432f-9c73-e1bad1c55a4b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_200e68f5-6155-432f-9c73-e1bad1c55a4b" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_200e68f5-6155-432f-9c73-e1bad1c55a4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_0ac50a1f-931b-448b-b274-9389dea67ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_200e68f5-6155-432f-9c73-e1bad1c55a4b" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_0ac50a1f-931b-448b-b274-9389dea67ff8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_827110ef-ac0d-43a7-8eb1-cfe74e0ae381" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_0ac50a1f-931b-448b-b274-9389dea67ff8" xlink:to="loc_us-gaap_DomesticCountryMember_827110ef-ac0d-43a7-8eb1-cfe74e0ae381" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_5b10c0fa-b9c1-4335-8183-af9275f75616" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_0ac50a1f-931b-448b-b274-9389dea67ff8" xlink:to="loc_us-gaap_ForeignCountryMember_5b10c0fa-b9c1-4335-8183-af9275f75616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8cc776a1-f369-462d-9f5c-8e50973c8d69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_d6fa57d2-f145-4360-b7e0-3ce103bb2cf4" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8cc776a1-f369-462d-9f5c-8e50973c8d69" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/TaxesNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#TaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/TaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardTable_90ebd18e-3b8b-4e9d-86df-b70e036a0f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_TaxCreditCarryforwardTable_90ebd18e-3b8b-4e9d-86df-b70e036a0f5f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_709788a4-f702-4375-a0ce-8173ccd3e8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TaxCreditCarryforwardTable_90ebd18e-3b8b-4e9d-86df-b70e036a0f5f" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_709788a4-f702-4375-a0ce-8173ccd3e8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_709788a4-f702-4375-a0ce-8173ccd3e8ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_709788a4-f702-4375-a0ce-8173ccd3e8ae" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_709788a4-f702-4375-a0ce-8173ccd3e8ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_7069425a-d5e5-4122-8fee-e7cccb8ded1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_709788a4-f702-4375-a0ce-8173ccd3e8ae" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_7069425a-d5e5-4122-8fee-e7cccb8ded1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_441832b8-aaa3-46c8-ac04-19ce2589af9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_7069425a-d5e5-4122-8fee-e7cccb8ded1d" xlink:to="loc_us-gaap_DomesticCountryMember_441832b8-aaa3-46c8-ac04-19ce2589af9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_688d3156-e4c3-410f-8bfe-3dac1613e520" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_7069425a-d5e5-4122-8fee-e7cccb8ded1d" xlink:to="loc_us-gaap_ForeignCountryMember_688d3156-e4c3-410f-8bfe-3dac1613e520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_50c21219-6f34-4960-9fd8-131a30eee769" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TaxCreditCarryforwardTable_90ebd18e-3b8b-4e9d-86df-b70e036a0f5f" xlink:to="loc_srt_RangeAxis_50c21219-6f34-4960-9fd8-131a30eee769" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_50c21219-6f34-4960-9fd8-131a30eee769_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_50c21219-6f34-4960-9fd8-131a30eee769" xlink:to="loc_srt_RangeMember_50c21219-6f34-4960-9fd8-131a30eee769_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8ffef410-d07c-4a0a-a2f4-0d3ef63d8389" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_50c21219-6f34-4960-9fd8-131a30eee769" xlink:to="loc_srt_RangeMember_8ffef410-d07c-4a0a-a2f4-0d3ef63d8389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_eb431f4a-2a4d-4c04-866c-78a03da084c9" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8ffef410-d07c-4a0a-a2f4-0d3ef63d8389" xlink:to="loc_srt_MinimumMember_eb431f4a-2a4d-4c04-866c-78a03da084c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_41743363-15bf-44c9-b51c-59c973328338" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8ffef410-d07c-4a0a-a2f4-0d3ef63d8389" xlink:to="loc_srt_MaximumMember_41743363-15bf-44c9-b51c-59c973328338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2ee579a2-4323-4478-8d28-1cbf5f1701d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2ee579a2-4323-4478-8d28-1cbf5f1701d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration_e94fa373-66d7-4804-bf01-4d2e34b2d266" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration_e94fa373-66d7-4804-bf01-4d2e34b2d266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_b1d0f65e-f580-4a1e-8f43-c456eca7cb5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_b1d0f65e-f580-4a1e-8f43-c456eca7cb5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_c547ebbe-f6a7-4f7c-9c20-8443a6335e26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_c547ebbe-f6a7-4f7c-9c20-8443a6335e26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DeferredTaxAssetOperatingLossCarryforwardPeriod_ba9b2308-5ad8-462b-991f-e7d5036360d2" xlink:href="rxt-20231231.xsd#rxt_DeferredTaxAssetOperatingLossCarryforwardPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_rxt_DeferredTaxAssetOperatingLossCarryforwardPeriod_ba9b2308-5ad8-462b-991f-e7d5036360d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetInterestCarryforward_e2acb57d-1f4c-40b5-8b1b-bb34bf5f2763" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetInterestCarryforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_DeferredTaxAssetInterestCarryforward_e2acb57d-1f4c-40b5-8b1b-bb34bf5f2763" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_300d1196-5f6d-44e0-901b-e5e8e0e91f61" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_300d1196-5f6d-44e0-901b-e5e8e0e91f61" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_4b930698-6d81-4ee8-a063-1b6fb56b6185" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardLineItems_f9423d2e-e416-437c-bbd7-b8fdd8e9b957" xlink:to="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_4b930698-6d81-4ee8-a063-1b6fb56b6185" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DerivativesNarrativeDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DerivativesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DerivativesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_31ba8a08-6885-4f8a-ad32-c37f34dc57cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_31ba8a08-6885-4f8a-ad32-c37f34dc57cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_31ba8a08-6885-4f8a-ad32-c37f34dc57cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_31ba8a08-6885-4f8a-ad32-c37f34dc57cd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_31ba8a08-6885-4f8a-ad32-c37f34dc57cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f3fb54d0-3a33-4cd4-98e8-a23139c129da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_31ba8a08-6885-4f8a-ad32-c37f34dc57cd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f3fb54d0-3a33-4cd4-98e8-a23139c129da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_91d2de5d-2917-42f0-80c2-abb5fed98f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f3fb54d0-3a33-4cd4-98e8-a23139c129da" xlink:to="loc_us-gaap_InterestRateSwapMember_91d2de5d-2917-42f0-80c2-abb5fed98f9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ReceiveFixedInterestRateSwapMember_e5fbd607-19a2-4df7-9cac-f52fbde7c90c" xlink:href="rxt-20231231.xsd#rxt_ReceiveFixedInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_91d2de5d-2917-42f0-80c2-abb5fed98f9d" xlink:to="loc_rxt_ReceiveFixedInterestRateSwapMember_e5fbd607-19a2-4df7-9cac-f52fbde7c90c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PayFixedInterestRateSwapMember_1fa083c4-7417-43fe-a17f-c41ffd0a4cc0" xlink:href="rxt-20231231.xsd#rxt_PayFixedInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_91d2de5d-2917-42f0-80c2-abb5fed98f9d" xlink:to="loc_rxt_PayFixedInterestRateSwapMember_1fa083c4-7417-43fe-a17f-c41ffd0a4cc0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapNineMember_30cc6fd1-5af0-4778-9480-d37bf71e862e" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f3fb54d0-3a33-4cd4-98e8-a23139c129da" xlink:to="loc_rxt_InterestRateSwapNineMember_30cc6fd1-5af0-4778-9480-d37bf71e862e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ForeignExchangeForwardTwoMember_e2e4bf64-0354-41f2-beeb-13dade13ae9b" xlink:href="rxt-20231231.xsd#rxt_ForeignExchangeForwardTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f3fb54d0-3a33-4cd4-98e8-a23139c129da" xlink:to="loc_rxt_ForeignExchangeForwardTwoMember_e2e4bf64-0354-41f2-beeb-13dade13ae9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_81f635d9-bd5a-4ae8-9805-1fa682af43e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_81f635d9-bd5a-4ae8-9805-1fa682af43e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_81f635d9-bd5a-4ae8-9805-1fa682af43e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_81f635d9-bd5a-4ae8-9805-1fa682af43e9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_81f635d9-bd5a-4ae8-9805-1fa682af43e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_1d22988b-2dcb-4502-912a-91e20f3dadfd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_81f635d9-bd5a-4ae8-9805-1fa682af43e9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_1d22988b-2dcb-4502-912a-91e20f3dadfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_906e4b15-aa94-4d38-a10d-913744aa5455" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_1d22988b-2dcb-4502-912a-91e20f3dadfd" xlink:to="loc_us-gaap_CashFlowHedgingMember_906e4b15-aa94-4d38-a10d-913744aa5455" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_2a21c685-6347-4e5f-89f6-fe6dd0f1d268" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:to="loc_us-gaap_HedgingDesignationAxis_2a21c685-6347-4e5f-89f6-fe6dd0f1d268" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_2a21c685-6347-4e5f-89f6-fe6dd0f1d268_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_2a21c685-6347-4e5f-89f6-fe6dd0f1d268" xlink:to="loc_us-gaap_HedgingDesignationDomain_2a21c685-6347-4e5f-89f6-fe6dd0f1d268_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_45376f7d-e467-47e8-96ba-494dff3b4561" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_2a21c685-6347-4e5f-89f6-fe6dd0f1d268" xlink:to="loc_us-gaap_HedgingDesignationDomain_45376f7d-e467-47e8-96ba-494dff3b4561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_a464f559-79bf-4a8c-b3c8-acd1de3546a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_45376f7d-e467-47e8-96ba-494dff3b4561" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_a464f559-79bf-4a8c-b3c8-acd1de3546a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2109c971-1bd7-4c93-b43e-44d8b78a2a2f" xlink:to="loc_us-gaap_VariableRateAxis_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64" xlink:to="loc_us-gaap_VariableRateDomain_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_040eb067-bdf9-4ecf-88f7-a7375573f266" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_d1875bc8-47a0-4703-8e4a-fe8a3f03ce64" xlink:to="loc_us-gaap_VariableRateDomain_040eb067-bdf9-4ecf-88f7-a7375573f266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_LondonInterbankOfferedRateLIBORMember1Member_d6179281-6acd-448d-a1b2-3da038bbc715" xlink:href="rxt-20231231.xsd#rxt_LondonInterbankOfferedRateLIBORMember1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_040eb067-bdf9-4ecf-88f7-a7375573f266" xlink:to="loc_rxt_LondonInterbankOfferedRateLIBORMember1Member_d6179281-6acd-448d-a1b2-3da038bbc715" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ThreeMonthLIBORMember_e4c8095f-c77a-4d1d-b6e4-26b9e588ed75" xlink:href="rxt-20231231.xsd#rxt_ThreeMonthLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_040eb067-bdf9-4ecf-88f7-a7375573f266" xlink:to="loc_rxt_ThreeMonthLIBORMember_e4c8095f-c77a-4d1d-b6e4-26b9e588ed75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_SecuredOvernightFinancingRateSOFRMember_c2da60eb-c38c-424c-89e9-8b7e85a2dffe" xlink:href="rxt-20231231.xsd#rxt_SecuredOvernightFinancingRateSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_040eb067-bdf9-4ecf-88f7-a7375573f266" xlink:to="loc_rxt_SecuredOvernightFinancingRateSOFRMember_c2da60eb-c38c-424c-89e9-8b7e85a2dffe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_e305017c-9236-4e3a-b5e0-5b6a3da3f007" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeLiabilities_e305017c-9236-4e3a-b5e0-5b6a3da3f007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_06077737-b936-4a72-b333-607582f86fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeNotionalAmount_06077737-b936-4a72-b333-607582f86fbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_de34cf83-8178-4be4-abe5-c1c826bd0a30" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_de34cf83-8178-4be4-abe5-c1c826bd0a30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_24dbdb4a-e3bd-46b1-9918-51760af46d52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_24dbdb4a-e3bd-46b1-9918-51760af46d52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_7e40a1b8-7795-4c18-8889-e3888d83d638" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_7e40a1b8-7795-4c18-8889-e3888d83d638" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFloorInterestRate_bcd71696-47e7-40dd-b054-8a4fdc2c08a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFloorInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_DerivativeFloorInterestRate_bcd71696-47e7-40dd-b054-8a4fdc2c08a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_225efb3c-7334-4c1e-b487-4c8491b3628b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_InterestExpense_225efb3c-7334-4c1e-b487-4c8491b3628b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_7f57f63e-7e75-4819-896d-9417a666aa53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_5618d3ef-b6e7-4e44-9733-c35682f1ce7f" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_7f57f63e-7e75-4819-896d-9417a666aa53" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DerivativesInterestRateSwapsOutstandingDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DerivativesInterestRateSwapsOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DerivativesInterestRateSwapsOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_20263446-e588-4d0d-a72c-445bf570fbe4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_2d5db04f-7212-42be-9d33-3c5d9f1f07ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_20263446-e588-4d0d-a72c-445bf570fbe4" xlink:to="loc_us-gaap_DerivativeTable_2d5db04f-7212-42be-9d33-3c5d9f1f07ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8063a31a-e96f-4002-bf1c-23540fdd8b36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2d5db04f-7212-42be-9d33-3c5d9f1f07ef" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8063a31a-e96f-4002-bf1c-23540fdd8b36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8063a31a-e96f-4002-bf1c-23540fdd8b36_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8063a31a-e96f-4002-bf1c-23540fdd8b36" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8063a31a-e96f-4002-bf1c-23540fdd8b36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ea8a2914-564e-48bd-8636-593fdec2abaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8063a31a-e96f-4002-bf1c-23540fdd8b36" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ea8a2914-564e-48bd-8636-593fdec2abaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ea8a2914-564e-48bd-8636-593fdec2abaa" xlink:to="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapTwoMember_37fa4768-e394-49ea-89aa-b29812643b18" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapTwoMember_37fa4768-e394-49ea-89aa-b29812643b18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapThreeMember_94478a90-6a14-42a5-9c8d-f08ebfca7bd7" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapThreeMember_94478a90-6a14-42a5-9c8d-f08ebfca7bd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapFourMember_f890b908-5627-42e6-9552-3bd663076215" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapFourMember_f890b908-5627-42e6-9552-3bd663076215" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapFiveMember_4dd285ec-79a6-4255-aed6-39b971941483" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapFiveMember_4dd285ec-79a6-4255-aed6-39b971941483" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapSixMember_d181cefd-c05c-4eb3-9cd5-3d602c167578" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapSixMember_d181cefd-c05c-4eb3-9cd5-3d602c167578" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapSevenMember_88ca8372-df85-467d-a1dd-7fec25db97d7" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapSevenMember_88ca8372-df85-467d-a1dd-7fec25db97d7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapEightBasisSwapMember_9b960d60-44bc-403f-a4b6-b175cb11d97b" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapEightBasisSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapEightBasisSwapMember_9b960d60-44bc-403f-a4b6-b175cb11d97b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestRateSwapNineMember_4a658460-7ea1-49a9-a4ca-19e8316cd4a5" xlink:href="rxt-20231231.xsd#rxt_InterestRateSwapNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateSwapMember_760a548b-de35-4b38-b527-daf60d025384" xlink:to="loc_rxt_InterestRateSwapNineMember_4a658460-7ea1-49a9-a4ca-19e8316cd4a5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_dcb819ec-a8d9-49ce-aba7-ec75467da690" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_20263446-e588-4d0d-a72c-445bf570fbe4" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_dcb819ec-a8d9-49ce-aba7-ec75467da690" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_efe1d41a-c6a4-47f3-bdfc-b3a61bcfbc31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_20263446-e588-4d0d-a72c-445bf570fbe4" xlink:to="loc_us-gaap_DerivativeNotionalAmount_efe1d41a-c6a4-47f3-bdfc-b3a61bcfbc31" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DerivativesScheduleofFairValuesofDerivativesontheConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DerivativesScheduleofFairValuesofDerivativesontheConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DerivativesScheduleofFairValuesofDerivativesontheConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_168a2e62-d6fd-416f-8f36-5d5e0a32b76b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a2988d27-4f43-4d33-9b6f-ac8757c1297c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_168a2e62-d6fd-416f-8f36-5d5e0a32b76b" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a2988d27-4f43-4d33-9b6f-ac8757c1297c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a2988d27-4f43-4d33-9b6f-ac8757c1297c" xlink:to="loc_us-gaap_HedgingDesignationAxis_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7" xlink:to="loc_us-gaap_HedgingDesignationDomain_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_c4b79ce5-b51f-4064-95a8-13d299d8558c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_5c4f7347-f4c4-4ef2-8f77-7b8f552b1fb7" xlink:to="loc_us-gaap_HedgingDesignationDomain_c4b79ce5-b51f-4064-95a8-13d299d8558c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cfb4e6f4-5bdc-4836-942b-61a92fe386af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_c4b79ce5-b51f-4064-95a8-13d299d8558c" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cfb4e6f4-5bdc-4836-942b-61a92fe386af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_d9c638b8-3881-4685-8531-fb8dd914634c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a2988d27-4f43-4d33-9b6f-ac8757c1297c" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_d9c638b8-3881-4685-8531-fb8dd914634c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_d9c638b8-3881-4685-8531-fb8dd914634c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9c638b8-3881-4685-8531-fb8dd914634c" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_d9c638b8-3881-4685-8531-fb8dd914634c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_d9c638b8-3881-4685-8531-fb8dd914634c" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_3c265dc1-e936-4daa-95f6-20911c28e80f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_3c265dc1-e936-4daa-95f6-20911c28e80f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_8c9f5bc3-8aa6-48b7-aa56-49916344a00a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_8c9f5bc3-8aa6-48b7-aa56-49916344a00a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_ff21b3a9-2cda-47aa-963b-0833471f4ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_ff21b3a9-2cda-47aa-963b-0833471f4ba5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_368eeb9a-3de5-4bc7-bf6f-7c96a632fa1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d173f9a-f356-415c-a69b-eb97e036ba78" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_368eeb9a-3de5-4bc7-bf6f-7c96a632fa1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_1a100744-0c6e-45a4-a730-b9594e3533c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_a2988d27-4f43-4d33-9b6f-ac8757c1297c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_1a100744-0c6e-45a4-a730-b9594e3533c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1a100744-0c6e-45a4-a730-b9594e3533c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1a100744-0c6e-45a4-a730-b9594e3533c9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1a100744-0c6e-45a4-a730-b9594e3533c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0cafd1c7-d25a-4353-9a7d-e8935de30a88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1a100744-0c6e-45a4-a730-b9594e3533c9" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0cafd1c7-d25a-4353-9a7d-e8935de30a88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_a856869c-a11d-4e15-b321-01a52e98d5c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cafd1c7-d25a-4353-9a7d-e8935de30a88" xlink:to="loc_us-gaap_InterestRateSwapMember_a856869c-a11d-4e15-b321-01a52e98d5c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_faf7e229-67ed-446f-92b3-ebfb0e33ea89" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_168a2e62-d6fd-416f-8f36-5d5e0a32b76b" xlink:to="loc_us-gaap_DerivativeAssets_faf7e229-67ed-446f-92b3-ebfb0e33ea89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_b61357fe-4086-41a1-9299-ac8c8e1d65f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_168a2e62-d6fd-416f-8f36-5d5e0a32b76b" xlink:to="loc_us-gaap_DerivativeLiabilities_b61357fe-4086-41a1-9299-ac8c8e1d65f0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DerivativesDerivativesPresentedonaNetAssetandNetLiabilitybasisDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DerivativesDerivativesPresentedonaNetAssetandNetLiabilitybasisDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DerivativesDerivativesPresentedonaNetAssetandNetLiabilitybasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_180be884-849d-4f34-aafa-2760677254a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_725495bf-647e-4871-b788-73e108a54686" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_180be884-849d-4f34-aafa-2760677254a3" xlink:to="loc_us-gaap_DerivativeTable_725495bf-647e-4871-b788-73e108a54686" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_725495bf-647e-4871-b788-73e108a54686" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_53ac218b-aab3-41bd-aba6-bce7e4662072" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7d9ec0bf-5ccd-4b53-aa2e-b7017dc21205" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_53ac218b-aab3-41bd-aba6-bce7e4662072" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_b8e66d95-7281-4dd3-9b32-5cf85fe02114" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_53ac218b-aab3-41bd-aba6-bce7e4662072" xlink:to="loc_us-gaap_InterestRateSwapMember_b8e66d95-7281-4dd3-9b32-5cf85fe02114" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_535f54db-8f2a-407a-8b8c-237368807c1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_180be884-849d-4f34-aafa-2760677254a3" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_535f54db-8f2a-407a-8b8c-237368807c1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_4a509de3-96ad-4466-b81a-30388862ddaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_535f54db-8f2a-407a-8b8c-237368807c1b" xlink:to="loc_us-gaap_DerivativeAssets_4a509de3-96ad-4466-b81a-30388862ddaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_bd9d3511-0724-4f5e-b4dc-667978eaa67e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_535f54db-8f2a-407a-8b8c-237368807c1b" xlink:to="loc_us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction_bd9d3511-0724-4f5e-b4dc-667978eaa67e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f9ba3d92-1e2a-4de3-b887-bacc92beb0c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_535f54db-8f2a-407a-8b8c-237368807c1b" xlink:to="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f9ba3d92-1e2a-4de3-b887-bacc92beb0c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_eac8282b-e6ca-4bc2-8d01-dd5eb58d7a53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_180be884-849d-4f34-aafa-2760677254a3" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_eac8282b-e6ca-4bc2-8d01-dd5eb58d7a53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_df3443e7-0085-4435-97cc-a519f27a0c71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_eac8282b-e6ca-4bc2-8d01-dd5eb58d7a53" xlink:to="loc_us-gaap_DerivativeLiabilities_df3443e7-0085-4435-97cc-a519f27a0c71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_caa2e458-9bee-4394-9a08-04da8514aa9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_eac8282b-e6ca-4bc2-8d01-dd5eb58d7a53" xlink:to="loc_us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction_caa2e458-9bee-4394-9a08-04da8514aa9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_edc72dc3-e52b-4001-bf02-7616f1485a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_eac8282b-e6ca-4bc2-8d01-dd5eb58d7a53" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_edc72dc3-e52b-4001-bf02-7616f1485a2a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/DerivativesEffectofDerivativesontheConsolidatedStatementsofComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#DerivativesEffectofDerivativesontheConsolidatedStatementsofComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/DerivativesEffectofDerivativesontheConsolidatedStatementsofComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_65e9ef20-edf2-46ae-86d8-2c718996c53b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_351ef4f3-ac29-4b24-874a-d316a08eb60e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_65e9ef20-edf2-46ae-86d8-2c718996c53b" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_351ef4f3-ac29-4b24-874a-d316a08eb60e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_428ef8f8-4dd2-4112-8bd6-34630e2c70ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_351ef4f3-ac29-4b24-874a-d316a08eb60e" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_428ef8f8-4dd2-4112-8bd6-34630e2c70ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_428ef8f8-4dd2-4112-8bd6-34630e2c70ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_428ef8f8-4dd2-4112-8bd6-34630e2c70ef" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_428ef8f8-4dd2-4112-8bd6-34630e2c70ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6ac92359-b674-44ef-9504-ef4254878e49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_428ef8f8-4dd2-4112-8bd6-34630e2c70ef" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6ac92359-b674-44ef-9504-ef4254878e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_b484fddd-84ff-4264-9fff-e6d0c2f1729f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6ac92359-b674-44ef-9504-ef4254878e49" xlink:to="loc_us-gaap_InterestExpenseMember_b484fddd-84ff-4264-9fff-e6d0c2f1729f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_8f76014e-d6a7-4828-a83c-f98cb632fb6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6ac92359-b674-44ef-9504-ef4254878e49" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_8f76014e-d6a7-4828-a83c-f98cb632fb6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_4d981d6c-2c3f-4041-a5d3-5fc983b386f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_351ef4f3-ac29-4b24-874a-d316a08eb60e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_4d981d6c-2c3f-4041-a5d3-5fc983b386f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4d981d6c-2c3f-4041-a5d3-5fc983b386f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4d981d6c-2c3f-4041-a5d3-5fc983b386f1" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4d981d6c-2c3f-4041-a5d3-5fc983b386f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_33c78ac3-3ee1-4973-819b-36d593c6ecb1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4d981d6c-2c3f-4041-a5d3-5fc983b386f1" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_33c78ac3-3ee1-4973-819b-36d593c6ecb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_4af1b315-8626-42d9-90ae-b13750dd9013" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_33c78ac3-3ee1-4973-819b-36d593c6ecb1" xlink:to="loc_us-gaap_InterestRateSwapMember_4af1b315-8626-42d9-90ae-b13750dd9013" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_922bc11b-9c48-46a1-b642-75e18c453ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_33c78ac3-3ee1-4973-819b-36d593c6ecb1" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_922bc11b-9c48-46a1-b642-75e18c453ce4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ForeignExchangeForwardTwoMember_8076994a-953a-4794-a202-50423c780fb1" xlink:href="rxt-20231231.xsd#rxt_ForeignExchangeForwardTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_33c78ac3-3ee1-4973-819b-36d593c6ecb1" xlink:to="loc_rxt_ForeignExchangeForwardTwoMember_8076994a-953a-4794-a202-50423c780fb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_3f73a79d-8b50-4ae0-8b6e-0ce94b65c881" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_65e9ef20-edf2-46ae-86d8-2c718996c53b" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_3f73a79d-8b50-4ae0-8b6e-0ce94b65c881" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_3633875b-04ba-4567-ab87-80454ccba6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_65e9ef20-edf2-46ae-86d8-2c718996c53b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_3633875b-04ba-4567-ab87-80454ccba6b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_55548649-74ad-41b7-a18f-7669c055ee0b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_65e9ef20-edf2-46ae-86d8-2c718996c53b" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_55548649-74ad-41b7-a18f-7669c055ee0b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_95f5da9c-92d1-46a5-b300-824e32f840a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_95f5da9c-92d1-46a5-b300-824e32f840a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_03d15869-efe7-489c-9e47-234995d3e96c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_95f5da9c-92d1-46a5-b300-824e32f840a3" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_03d15869-efe7-489c-9e47-234995d3e96c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_03d15869-efe7-489c-9e47-234995d3e96c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_03d15869-efe7-489c-9e47-234995d3e96c" xlink:to="loc_us-gaap_EquityComponentDomain_03d15869-efe7-489c-9e47-234995d3e96c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a22ff540-0562-4244-988a-0f9258bdc7a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_03d15869-efe7-489c-9e47-234995d3e96c" xlink:to="loc_us-gaap_EquityComponentDomain_a22ff540-0562-4244-988a-0f9258bdc7a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32fcdbf4-fc1a-4551-b6d9-ed9c3a545c3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a22ff540-0562-4244-988a-0f9258bdc7a2" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32fcdbf4-fc1a-4551-b6d9-ed9c3a545c3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_005c9360-109a-47e7-b3ad-ef38d4c0a6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32fcdbf4-fc1a-4551-b6d9-ed9c3a545c3d" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_005c9360-109a-47e7-b3ad-ef38d4c0a6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_a60aac06-7da6-470f-a099-58a527cdf846" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32fcdbf4-fc1a-4551-b6d9-ed9c3a545c3d" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_a60aac06-7da6-470f-a099-58a527cdf846" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_987eac6c-91e6-4852-8de7-8432b3442e4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_95f5da9c-92d1-46a5-b300-824e32f840a3" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_987eac6c-91e6-4852-8de7-8432b3442e4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_987eac6c-91e6-4852-8de7-8432b3442e4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_987eac6c-91e6-4852-8de7-8432b3442e4a" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_987eac6c-91e6-4852-8de7-8432b3442e4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_b029919d-dedb-4100-a651-fd7eead4b423" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_987eac6c-91e6-4852-8de7-8432b3442e4a" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_b029919d-dedb-4100-a651-fd7eead4b423" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_1342e282-c950-4bc4-ad60-cf7991afd7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_b029919d-dedb-4100-a651-fd7eead4b423" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_1342e282-c950-4bc4-ad60-cf7991afd7d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f361c15e-2f5c-4d55-9f1d-d397dc930dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:to="loc_us-gaap_StockholdersEquity_f361c15e-2f5c-4d55-9f1d-d397dc930dd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_cb08b844-e132-42e5-a0c5-91edad54f7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_cb08b844-e132-42e5-a0c5-91edad54f7fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_fa26a80e-ae7f-4111-9a00-edf07f723580" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_fa26a80e-ae7f-4111-9a00-edf07f723580" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_04a0a547-8937-41c6-84bb-548244793138" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7801c8d6-6177-4b9d-9243-24cf1de12f7a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_04a0a547-8937-41c6-84bb-548244793138" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_59b9fac5-00b7-401c-aba0-3dfd2af75a11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent_48ce48d7-edae-405c-a867-17982f0bdf04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent_48ce48d7-edae-405c-a867-17982f0bdf04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_56710763-50c2-4486-a1d1-3702d8405013" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax_56710763-50c2-4486-a1d1-3702d8405013" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_cbdc700d-370c-47ca-bc06-6e9f1226a087" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax_cbdc700d-370c-47ca-bc06-6e9f1226a087" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_2f1fa0a7-6817-49d0-8384-a8de7d49c7c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_us-gaap_InterestExpense_2f1fa0a7-6817-49d0-8384-a8de7d49c7c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InterestExpenseAmortizationOfOffMarketSwapOffset_841fc191-48ee-4024-bc9e-ebc6ea394ab0" xlink:href="rxt-20231231.xsd#rxt_InterestExpenseAmortizationOfOffMarketSwapOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_67ccf64a-2b70-4121-b92f-6756c25a54c4" xlink:to="loc_rxt_InterestExpenseAmortizationOfOffMarketSwapOffset_841fc191-48ee-4024-bc9e-ebc6ea394ab0" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_6b85d88e-182d-4e9d-8ecd-4387dba58bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6b85d88e-182d-4e9d-8ecd-4387dba58bd8" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_730e0449-2b53-4989-8581-0dc8d71ade02" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_srt_CounterpartyNameAxis_730e0449-2b53-4989-8581-0dc8d71ade02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_730e0449-2b53-4989-8581-0dc8d71ade02_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_730e0449-2b53-4989-8581-0dc8d71ade02" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_730e0449-2b53-4989-8581-0dc8d71ade02_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5ec500a9-4876-4d3c-ae04-ef8bb5f4aad3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_730e0449-2b53-4989-8581-0dc8d71ade02" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5ec500a9-4876-4d3c-ae04-ef8bb5f4aad3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ApolloGlobalSecuritiesLLCMember_42f2260f-049d-4a4b-b38a-fbe6ade3857c" xlink:href="rxt-20231231.xsd#rxt_ApolloGlobalSecuritiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5ec500a9-4876-4d3c-ae04-ef8bb5f4aad3" xlink:to="loc_rxt_ApolloGlobalSecuritiesLLCMember_42f2260f-049d-4a4b-b38a-fbe6ade3857c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_c9f272a3-9b05-4faa-946c-65786156cbe9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_us-gaap_DebtInstrumentAxis_c9f272a3-9b05-4faa-946c-65786156cbe9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c9f272a3-9b05-4faa-946c-65786156cbe9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_c9f272a3-9b05-4faa-946c-65786156cbe9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c9f272a3-9b05-4faa-946c-65786156cbe9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0fa261e5-420a-422c-8d03-d7516b04cbd8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_c9f272a3-9b05-4faa-946c-65786156cbe9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0fa261e5-420a-422c-8d03-d7516b04cbd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_A350SeniorSecuredNotesDue2028Member_786573ca-e82a-4823-a0af-cf032a442512" xlink:href="rxt-20231231.xsd#rxt_A350SeniorSecuredNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0fa261e5-420a-422c-8d03-d7516b04cbd8" xlink:to="loc_rxt_A350SeniorSecuredNotesDue2028Member_786573ca-e82a-4823-a0af-cf032a442512" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_ef43e17a-8586-4932-90e1-3e89e633095a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8de2fcbd-1607-4e3c-a5c0-41ea878ac5b6" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_ef43e17a-8586-4932-90e1-3e89e633095a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_ArrangerFeesMember_6820f2d1-9126-4d8f-8a1d-185a07a04602" xlink:href="rxt-20231231.xsd#rxt_ArrangerFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_ef43e17a-8586-4932-90e1-3e89e633095a" xlink:to="loc_rxt_ArrangerFeesMember_6820f2d1-9126-4d8f-8a1d-185a07a04602" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8" xlink:to="loc_us-gaap_RelatedPartyDomain_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_2df5f922-faf8-4239-b440-efd98a5f0beb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c762cdc9-42bb-45ec-a5df-c5fae7bea3d8" xlink:to="loc_us-gaap_RelatedPartyDomain_2df5f922-faf8-4239-b440-efd98a5f0beb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_c9e31b1c-4b25-4d1d-a088-1cb4b5b872d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_2df5f922-faf8-4239-b440-efd98a5f0beb" xlink:to="loc_us-gaap_RelatedPartyMember_c9e31b1c-4b25-4d1d-a088-1cb4b5b872d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_798eff4e-ff38-4d52-b843-fe37c09d75aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_798eff4e-ff38-4d52-b843-fe37c09d75aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_798eff4e-ff38-4d52-b843-fe37c09d75aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_798eff4e-ff38-4d52-b843-fe37c09d75aa" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_798eff4e-ff38-4d52-b843-fe37c09d75aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_003addba-a278-462d-8e4d-871ae43d565d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_798eff4e-ff38-4d52-b843-fe37c09d75aa" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_003addba-a278-462d-8e4d-871ae43d565d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_a16474b2-ba72-4b2c-a828-1578f54c4302" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_003addba-a278-462d-8e4d-871ae43d565d" xlink:to="loc_us-gaap_SeniorNotesMember_a16474b2-ba72-4b2c-a828-1578f54c4302" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_c147d9b6-b520-462e-868c-df0d5ea0a259" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f1a83caa-9332-4947-869a-c8be5d30d4f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a0f51bdd-9c8a-4e63-84c8-d1197dd3de1d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f1a83caa-9332-4947-869a-c8be5d30d4f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_DatapipeParentIncMember_c4a87cd3-7912-44be-a787-4c0fb35bc988" xlink:href="rxt-20231231.xsd#rxt_DatapipeParentIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f1a83caa-9332-4947-869a-c8be5d30d4f2" xlink:to="loc_rxt_DatapipeParentIncMember_c4a87cd3-7912-44be-a787-4c0fb35bc988" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_981cd07c-8d32-4372-8329-010787385ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6b85d88e-182d-4e9d-8ecd-4387dba58bd8" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_981cd07c-8d32-4372-8329-010787385ab8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3f5ca30c-96d5-4129-a325-d679e35cacf3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6b85d88e-182d-4e9d-8ecd-4387dba58bd8" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3f5ca30c-96d5-4129-a325-d679e35cacf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_43296a7a-c90e-446f-a721-9756def6e902" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_6b85d88e-182d-4e9d-8ecd-4387dba58bd8" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_43296a7a-c90e-446f-a721-9756def6e902" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/SegmentReportingReconciliationofRevenueandGrossProfitsfromSegmentstoConsolidatedDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#SegmentReportingReconciliationofRevenueandGrossProfitsfromSegmentstoConsolidatedDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/SegmentReportingReconciliationofRevenueandGrossProfitsfromSegmentstoConsolidatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingRevenueReconcilingItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a5d91988-825e-4fab-b98e-39e3cf941b16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a5d91988-825e-4fab-b98e-39e3cf941b16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5d91988-825e-4fab-b98e-39e3cf941b16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5d91988-825e-4fab-b98e-39e3cf941b16" xlink:to="loc_us-gaap_SegmentDomain_a5d91988-825e-4fab-b98e-39e3cf941b16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b5fb815c-2832-43f0-bbfa-a0b6dd42394e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5d91988-825e-4fab-b98e-39e3cf941b16" xlink:to="loc_us-gaap_SegmentDomain_b5fb815c-2832-43f0-bbfa-a0b6dd42394e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PublicCloudServicesSegmentMember_5d9ee537-ad79-46e1-b3b6-83a6d364c970" xlink:href="rxt-20231231.xsd#rxt_PublicCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b5fb815c-2832-43f0-bbfa-a0b6dd42394e" xlink:to="loc_rxt_PublicCloudServicesSegmentMember_5d9ee537-ad79-46e1-b3b6-83a6d364c970" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_4bd19e6d-c2a2-4644-985d-0d6e69e94f7d" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b5fb815c-2832-43f0-bbfa-a0b6dd42394e" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_4bd19e6d-c2a2-4644-985d-0d6e69e94f7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_cbe90aab-c40a-449d-8f2c-ce8b3a68739f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:to="loc_srt_ConsolidationItemsAxis_cbe90aab-c40a-449d-8f2c-ce8b3a68739f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_cbe90aab-c40a-449d-8f2c-ce8b3a68739f_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_cbe90aab-c40a-449d-8f2c-ce8b3a68739f" xlink:to="loc_srt_ConsolidationItemsDomain_cbe90aab-c40a-449d-8f2c-ce8b3a68739f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_fda27192-0f22-4d5c-85b0-f7dd0ffff679" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_cbe90aab-c40a-449d-8f2c-ce8b3a68739f" xlink:to="loc_srt_ConsolidationItemsDomain_fda27192-0f22-4d5c-85b0-f7dd0ffff679" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_c33bfccc-238f-44db-bf66-600975d765d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_fda27192-0f22-4d5c-85b0-f7dd0ffff679" xlink:to="loc_us-gaap_OperatingSegmentsMember_c33bfccc-238f-44db-bf66-600975d765d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CorporateAndReconcilingItemsMember_a5bb55cb-7d17-45d8-a51d-b204f6fce46a" xlink:href="rxt-20231231.xsd#rxt_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_fda27192-0f22-4d5c-85b0-f7dd0ffff679" xlink:to="loc_rxt_CorporateAndReconcilingItemsMember_a5bb55cb-7d17-45d8-a51d-b204f6fce46a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_75eb7bde-a011-4b25-8bc7-141573234ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_58b0ad4b-bfd5-45b1-8ee0-3764c871daf3" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_75eb7bde-a011-4b25-8bc7-141573234ed2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_710db3e1-0c8d-47c3-9ac1-b5f4fe3ba964" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_75eb7bde-a011-4b25-8bc7-141573234ed2" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_710db3e1-0c8d-47c3-9ac1-b5f4fe3ba964" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_fa965ce6-06db-4d3e-96f3-124b74b89259" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:to="loc_us-gaap_RestructuringPlanAxis_fa965ce6-06db-4d3e-96f3-124b74b89259" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_fa965ce6-06db-4d3e-96f3-124b74b89259_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_fa965ce6-06db-4d3e-96f3-124b74b89259" xlink:to="loc_us-gaap_RestructuringPlanDomain_fa965ce6-06db-4d3e-96f3-124b74b89259_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_64ded0eb-3004-404d-840e-27a5f47e8b65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_fa965ce6-06db-4d3e-96f3-124b74b89259" xlink:to="loc_us-gaap_RestructuringPlanDomain_64ded0eb-3004-404d-840e-27a5f47e8b65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_July2021RestructuringPlanMember_ae01dddb-5e61-48d0-a05c-c86d019662c9" xlink:href="rxt-20231231.xsd#rxt_July2021RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_64ded0eb-3004-404d-840e-27a5f47e8b65" xlink:to="loc_rxt_July2021RestructuringPlanMember_ae01dddb-5e61-48d0-a05c-c86d019662c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_29047214-5785-4c3c-9aba-89bddd8d16bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_d861f675-4809-4059-a47d-1269e2174b98" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_29047214-5785-4c3c-9aba-89bddd8d16bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_29047214-5785-4c3c-9aba-89bddd8d16bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_29047214-5785-4c3c-9aba-89bddd8d16bd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_29047214-5785-4c3c-9aba-89bddd8d16bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_969ee1c3-b204-4ae1-9dd6-4d4b74c17eb1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_29047214-5785-4c3c-9aba-89bddd8d16bd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_969ee1c3-b204-4ae1-9dd6-4d4b74c17eb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_cd92e447-2b1c-4e5b-aa27-54eed99a4870" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_969ee1c3-b204-4ae1-9dd6-4d4b74c17eb1" xlink:to="loc_us-gaap_EmployeeSeveranceMember_cd92e447-2b1c-4e5b-aa27-54eed99a4870" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_868ccdf9-f95f-4724-a57b-ccd204ddf9d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_868ccdf9-f95f-4724-a57b-ccd204ddf9d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_87ef28d0-c7af-4822-9a35-74a212bd16c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_OperatingIncomeLoss_87ef28d0-c7af-4822-9a35-74a212bd16c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_018de087-7042-457c-af38-cbad7aa4025d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_018de087-7042-457c-af38-cbad7aa4025d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_7a8291ef-d2be-4883-b59b-de1fb4dc1618" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_7a8291ef-d2be-4883-b59b-de1fb4dc1618" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_TransactionRelatedAdjustmentsNet_0d607566-83c1-419f-89eb-9a6556b16d03" xlink:href="rxt-20231231.xsd#rxt_TransactionRelatedAdjustmentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_rxt_TransactionRelatedAdjustmentsNet_0d607566-83c1-419f-89eb-9a6556b16d03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_RestructuringAndTransformationCosts_a0260a8c-d6eb-4ea9-90e5-8652a3993965" xlink:href="rxt-20231231.xsd#rxt_RestructuringAndTransformationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_rxt_RestructuringAndTransformationCosts_a0260a8c-d6eb-4ea9-90e5-8652a3993965" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_HostedExchangeIncidentExpenses_49e15dcf-0fe5-408f-9ad9-137688dbdef0" xlink:href="rxt-20231231.xsd#rxt_HostedExchangeIncidentExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_rxt_HostedExchangeIncidentExpenses_49e15dcf-0fe5-408f-9ad9-137688dbdef0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_22dc9d85-3542-4738-aa96-25676ef21c09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_22dc9d85-3542-4738-aa96-25676ef21c09" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8a052214-a94f-49ce-9a3c-d690c0172168" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_8a052214-a94f-49ce-9a3c-d690c0172168" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossOnContractTermination_a20dd0c6-f02e-4a29-9242-7aafea6be06f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossOnContractTermination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_LossOnContractTermination_a20dd0c6-f02e-4a29-9242-7aafea6be06f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AssetsImpairmentChargesExcludingGoodwill_06d26264-8a79-47ae-8171-4b7195d4d985" xlink:href="rxt-20231231.xsd#rxt_AssetsImpairmentChargesExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_rxt_AssetsImpairmentChargesExcludingGoodwill_06d26264-8a79-47ae-8171-4b7195d4d985" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties_4501fd62-ba76-4b23-aca0-1e2f7f92f778" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSaleOfProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_GainLossOnSaleOfProperties_4501fd62-ba76-4b23-aca0-1e2f7f92f778" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_a6f74f66-4808-4944-8f28-93a3ff873961" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_InterestExpense_a6f74f66-4808-4944-8f28-93a3ff873961" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_098a6fba-43c0-47f8-b30e-0d495df522ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_GainLossOnInvestments_098a6fba-43c0-47f8-b30e-0d495df522ee" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3be1e878-0efb-44a1-a8c0-c1123e08e2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3be1e878-0efb-44a1-a8c0-c1123e08e2aa" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_33664f00-954c-43e4-8ef5-ab778f12eea5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_33664f00-954c-43e4-8ef5-ab778f12eea5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_31bf69e1-42a7-40c3-8cf0-d248e485bfce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_31bf69e1-42a7-40c3-8cf0-d248e485bfce" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_20e78eee-d4d2-41ef-9822-36ada4c61b38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_RestructuringCharges_20e78eee-d4d2-41ef-9822-36ada4c61b38" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_3e3da710-a4ee-4492-a489-ce72a38c7599" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherRestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_3998f56b-8dc7-4c55-9cb4-ac2bf2465a63" xlink:to="loc_us-gaap_OtherRestructuringCosts_3e3da710-a4ee-4492-a489-ce72a38c7599" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/SegmentReportingScheduleofDepreciationDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#SegmentReportingScheduleofDepreciationDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/SegmentReportingScheduleofDepreciationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ad0dfa1d-1d2d-435d-ba27-db536334de2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_64857542-1037-4a37-98a4-1e72044eb8ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ad0dfa1d-1d2d-435d-ba27-db536334de2a" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_64857542-1037-4a37-98a4-1e72044eb8ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3ef90047-72ad-4016-847f-58bfff412d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_64857542-1037-4a37-98a4-1e72044eb8ee" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3ef90047-72ad-4016-847f-58bfff412d3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3ef90047-72ad-4016-847f-58bfff412d3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3ef90047-72ad-4016-847f-58bfff412d3a" xlink:to="loc_us-gaap_SegmentDomain_3ef90047-72ad-4016-847f-58bfff412d3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_32092738-ff13-470f-b39f-dfeef6104e58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3ef90047-72ad-4016-847f-58bfff412d3a" xlink:to="loc_us-gaap_SegmentDomain_32092738-ff13-470f-b39f-dfeef6104e58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PublicCloudServicesSegmentMember_6e47e6a3-9ee6-4832-9ba6-932723b1cb93" xlink:href="rxt-20231231.xsd#rxt_PublicCloudServicesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_32092738-ff13-470f-b39f-dfeef6104e58" xlink:to="loc_rxt_PublicCloudServicesSegmentMember_6e47e6a3-9ee6-4832-9ba6-932723b1cb93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_PrivateCloudServiceSegmentMember_476d3535-7d9f-4991-bbfd-4ff8bf3c0555" xlink:href="rxt-20231231.xsd#rxt_PrivateCloudServiceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_32092738-ff13-470f-b39f-dfeef6104e58" xlink:to="loc_rxt_PrivateCloudServiceSegmentMember_476d3535-7d9f-4991-bbfd-4ff8bf3c0555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_CorporateFunctionMember_f8c244fe-dc3f-4937-973c-2bb2d95b2f13" xlink:href="rxt-20231231.xsd#rxt_CorporateFunctionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_32092738-ff13-470f-b39f-dfeef6104e58" xlink:to="loc_rxt_CorporateFunctionMember_f8c244fe-dc3f-4937-973c-2bb2d95b2f13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_73161db0-5707-4081-9cce-3f760e93a3ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ad0dfa1d-1d2d-435d-ba27-db536334de2a" xlink:to="loc_us-gaap_Depreciation_73161db0-5707-4081-9cce-3f760e93a3ca" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/SegmentReportingGeographicInformationDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#SegmentReportingGeographicInformationDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/SegmentReportingGeographicInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00ba6ad0-29c1-4233-aea4-843d66da8404" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e2a64ad1-615a-440d-91ad-80451b2eaab8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00ba6ad0-29c1-4233-aea4-843d66da8404" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e2a64ad1-615a-440d-91ad-80451b2eaab8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_cc978152-2688-4eba-b272-684f5f72f2aa" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_e2a64ad1-615a-440d-91ad-80451b2eaab8" xlink:to="loc_srt_StatementGeographicalAxis_cc978152-2688-4eba-b272-684f5f72f2aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_cc978152-2688-4eba-b272-684f5f72f2aa_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_cc978152-2688-4eba-b272-684f5f72f2aa" xlink:to="loc_srt_SegmentGeographicalDomain_cc978152-2688-4eba-b272-684f5f72f2aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_cc978152-2688-4eba-b272-684f5f72f2aa" xlink:to="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_369fccad-a0f0-4d39-9386-525bbc735bd7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:to="loc_srt_AmericasMember_369fccad-a0f0-4d39-9386-525bbc735bd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_49959c92-bc07-4d09-a169-057ab5deb26d" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AmericasMember_369fccad-a0f0-4d39-9386-525bbc735bd7" xlink:to="loc_country_US_49959c92-bc07-4d09-a169-057ab5deb26d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_32f4e620-7a97-4825-ab5b-bf28084f25bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:to="loc_us-gaap_EMEAMember_32f4e620-7a97-4825-ab5b-bf28084f25bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_7f68a3cf-4c44-41f5-b3fd-9ee5ee555104" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EMEAMember_32f4e620-7a97-4825-ab5b-bf28084f25bb" xlink:to="loc_country_GB_7f68a3cf-4c44-41f5-b3fd-9ee5ee555104" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_2bca3595-8bdf-45b7-a7f0-d8e9f23acf01" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:to="loc_srt_AsiaPacificMember_2bca3595-8bdf-45b7-a7f0-d8e9f23acf01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_OtherForeignCountriesMember_aef48783-2487-409c-8ef4-36b7c94d646f" xlink:href="rxt-20231231.xsd#rxt_OtherForeignCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c44778ce-81ad-4a8b-837c-5647041baa3c" xlink:to="loc_rxt_OtherForeignCountriesMember_aef48783-2487-409c-8ef4-36b7c94d646f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8ffeeddd-215a-43a3-ad76-4ca3e6451586" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00ba6ad0-29c1-4233-aea4-843d66da8404" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8ffeeddd-215a-43a3-ad76-4ca3e6451586" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_48dae52d-bd4d-4628-8c3e-25bf7c9f0101" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_00ba6ad0-29c1-4233-aea4-843d66da8404" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_48dae52d-bd4d-4628-8c3e-25bf7c9f0101" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedBalanceSheetsDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_2177c8ee-13eb-42c0-923d-bd32e97f77ec" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedBalanceSheetStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementTable_c15d1b0f-2a4b-4657-bdb6-561db0204ce8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedBalanceSheetStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_2177c8ee-13eb-42c0-923d-bd32e97f77ec" xlink:to="loc_srt_CondensedBalanceSheetStatementTable_c15d1b0f-2a4b-4657-bdb6-561db0204ce8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_aa33a446-3ed0-40e1-bbfb-67b5b75fd886" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_c15d1b0f-2a4b-4657-bdb6-561db0204ce8" xlink:to="loc_srt_ConsolidatedEntitiesAxis_aa33a446-3ed0-40e1-bbfb-67b5b75fd886" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_aa33a446-3ed0-40e1-bbfb-67b5b75fd886_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_aa33a446-3ed0-40e1-bbfb-67b5b75fd886" xlink:to="loc_srt_ConsolidatedEntitiesDomain_aa33a446-3ed0-40e1-bbfb-67b5b75fd886_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1f2e001c-e85a-4178-be4f-6b62960ea2b1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_aa33a446-3ed0-40e1-bbfb-67b5b75fd886" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1f2e001c-e85a-4178-be4f-6b62960ea2b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_608ac88b-c4af-4f8b-9bee-d81d18b9d161" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1f2e001c-e85a-4178-be4f-6b62960ea2b1" xlink:to="loc_srt_ParentCompanyMember_608ac88b-c4af-4f8b-9bee-d81d18b9d161" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_32cf77bc-6c61-4ac0-bd9f-f369e21ffad1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_2177c8ee-13eb-42c0-923d-bd32e97f77ec" xlink:to="loc_us-gaap_AssetsAbstract_32cf77bc-6c61-4ac0-bd9f-f369e21ffad1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_InvestmentsInSubsidiaries_d4a5d54e-374e-413f-96a0-881b57e24520" xlink:href="rxt-20231231.xsd#rxt_InvestmentsInSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_32cf77bc-6c61-4ac0-bd9f-f369e21ffad1" xlink:to="loc_rxt_InvestmentsInSubsidiaries_d4a5d54e-374e-413f-96a0-881b57e24520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_92cda13b-dfc4-4b00-b2b9-1d84c08afa44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_32cf77bc-6c61-4ac0-bd9f-f369e21ffad1" xlink:to="loc_us-gaap_Assets_92cda13b-dfc4-4b00-b2b9-1d84c08afa44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_2177c8ee-13eb-42c0-923d-bd32e97f77ec" xlink:to="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_d8ab0cb6-bee8-4e57-811c-625ba5197ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_PreferredStockValue_d8ab0cb6-bee8-4e57-811c-625ba5197ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_3c165316-5f92-40d6-9f50-553c697df32e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_CommonStockValue_3c165316-5f92-40d6-9f50-553c697df32e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_3f47dc91-0b5f-49b0-8e97-025da8e9cf42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_AdditionalPaidInCapital_3f47dc91-0b5f-49b0-8e97-025da8e9cf42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_43353ea3-0c65-4b06-8ae3-fbedea5851bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_43353ea3-0c65-4b06-8ae3-fbedea5851bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62b34610-b3aa-4a31-a8f9-ff1ce5f8cb53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62b34610-b3aa-4a31-a8f9-ff1ce5f8cb53" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonValue_59f9dd23-ebb2-4b72-9fd1-a745fb9b6b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_TreasuryStockCommonValue_59f9dd23-ebb2-4b72-9fd1-a745fb9b6b8a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2344751c-b0d1-435b-9002-763c614dde00" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_StockholdersEquity_2344751c-b0d1-435b-9002-763c614dde00" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_3a8c7fe5-65b1-4f18-98e0-a1716c69ed10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_3a8c7fe5-65b1-4f18-98e0-a1716c69ed10" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_d4e73fbf-ad71-4a00-bed5-f5e0a8f40830" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_d4e73fbf-ad71-4a00-bed5-f5e0a8f40830" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_95f36199-e9e3-4efd-9b3f-7fa9b08ae1fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_95f36199-e9e3-4efd-9b3f-7fa9b08ae1fb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_704b9f1a-f518-4eda-b2e8-e5baf3bb9728" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_PreferredStockSharesIssued_704b9f1a-f518-4eda-b2e8-e5baf3bb9728" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_ee344b8a-b6c6-489e-9fef-b88b58c6c351" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_ee344b8a-b6c6-489e-9fef-b88b58c6c351" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_cd25b2fb-a11a-45c3-93b1-5f994145c0fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_cd25b2fb-a11a-45c3-93b1-5f994145c0fd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_f9954776-2e11-4bb0-8eda-7984858a90c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_f9954776-2e11-4bb0-8eda-7984858a90c3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_b4755a55-77fa-4f08-a12b-9f95a41c4be4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_CommonStockSharesIssued_b4755a55-77fa-4f08-a12b-9f95a41c4be4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_7d518162-51e2-4784-9a61-492f0ef35536" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_7d518162-51e2-4784-9a61-492f0ef35536" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_bf474175-596d-489a-9dd4-a1399b8acf5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_1356064c-2843-4f75-9fa5-e0eef7274f37" xlink:to="loc_us-gaap_TreasuryStockCommonShares_bf474175-596d-489a-9dd4-a1399b8acf5d" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.rackspace.com/role/CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedStatementsofComprehensiveLossDetails" xlink:type="simple" xlink:href="rxt-20231231.xsd#CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedStatementsofComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.rackspace.com/role/CondensedFinancialInformationofRegistrantParentCompanyOnlyCondensedStatementsofComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedStatementOfIncomeCaptionsLineItems_8fd5acca-4066-4f29-89bb-2e353958f2e4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedStatementOfIncomeCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedStatementOfComprehensiveIncomeTable_399a5444-c8f3-46c0-8faa-cca46cb899b8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CondensedStatementOfComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedStatementOfIncomeCaptionsLineItems_8fd5acca-4066-4f29-89bb-2e353958f2e4" xlink:to="loc_srt_CondensedStatementOfComprehensiveIncomeTable_399a5444-c8f3-46c0-8faa-cca46cb899b8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_87e4c777-88a1-4530-a7b5-aba66e892f38" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedStatementOfComprehensiveIncomeTable_399a5444-c8f3-46c0-8faa-cca46cb899b8" xlink:to="loc_srt_ConsolidatedEntitiesAxis_87e4c777-88a1-4530-a7b5-aba66e892f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_87e4c777-88a1-4530-a7b5-aba66e892f38_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_87e4c777-88a1-4530-a7b5-aba66e892f38" xlink:to="loc_srt_ConsolidatedEntitiesDomain_87e4c777-88a1-4530-a7b5-aba66e892f38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1ada4d26-38b6-4de9-b2cf-cfb0d5f7a985" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_87e4c777-88a1-4530-a7b5-aba66e892f38" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1ada4d26-38b6-4de9-b2cf-cfb0d5f7a985" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_962b07ed-1f68-4a75-a154-5f7998cbe459" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_1ada4d26-38b6-4de9-b2cf-cfb0d5f7a985" xlink:to="loc_srt_ParentCompanyMember_962b07ed-1f68-4a75-a154-5f7998cbe459" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f59ae9f6-a177-4f6f-a180-6c55211c4bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedStatementOfIncomeCaptionsLineItems_8fd5acca-4066-4f29-89bb-2e353958f2e4" xlink:to="loc_us-gaap_NetIncomeLoss_f59ae9f6-a177-4f6f-a180-6c55211c4bd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_BasicAndDilutedAbstract_f7d694de-f75f-41bd-94ae-56ed6e66d63a" xlink:href="rxt-20231231.xsd#rxt_BasicAndDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedStatementOfIncomeCaptionsLineItems_8fd5acca-4066-4f29-89bb-2e353958f2e4" xlink:to="loc_rxt_BasicAndDilutedAbstract_f7d694de-f75f-41bd-94ae-56ed6e66d63a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_b8afa14b-6b2f-4603-8d53-097f1349d0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxt_BasicAndDilutedAbstract_f7d694de-f75f-41bd-94ae-56ed6e66d63a" xlink:to="loc_us-gaap_EarningsPerShareBasic_b8afa14b-6b2f-4603-8d53-097f1349d0dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_6d4b1ca8-88c6-43aa-b0fa-e7afd2008726" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxt_BasicAndDilutedAbstract_f7d694de-f75f-41bd-94ae-56ed6e66d63a" xlink:to="loc_us-gaap_EarningsPerShareDiluted_6d4b1ca8-88c6-43aa-b0fa-e7afd2008726" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_13bec956-5069-4694-8b2d-6d921690d4c3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedStatementOfIncomeCaptionsLineItems_8fd5acca-4066-4f29-89bb-2e353958f2e4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_13bec956-5069-4694-8b2d-6d921690d4c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c47c9c61-efcd-4b69-a96e-c4085120823d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_13bec956-5069-4694-8b2d-6d921690d4c3" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c47c9c61-efcd-4b69-a96e-c4085120823d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2d04cd21-0024-4304-835e-03ef3df6032f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_13bec956-5069-4694-8b2d-6d921690d4c3" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2d04cd21-0024-4304-835e-03ef3df6032f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_AssetsImpairmentChargesExcludingGoodwill_fc9dce1c-b9d2-41df-832f-534408b631d0" xlink:href="rxt-20231231.xsd#rxt_AssetsImpairmentChargesExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_rxt_AssetsImpairmentChargesExcludingGoodwill_fc9dce1c-b9d2-41df-832f-534408b631d0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockMember" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_LongTermIncentiveCashUnitsMember_3de91346-fbef-4dd4-bc3e-4f7eaba2f087" xlink:href="rxt-20231231.xsd#rxt_LongTermIncentiveCashUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_rxt_LongTermIncentiveCashUnitsMember_3de91346-fbef-4dd4-bc3e-4f7eaba2f087" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_EmployeeStockMember" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_EquityClassifiedAwardsMember_78753936-42b8-478d-8e41-01822b0e2957" xlink:href="rxt-20231231.xsd#rxt_EquityClassifiedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_rxt_EquityClassifiedAwardsMember_78753936-42b8-478d-8e41-01822b0e2957" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_rxt_LiabilityClassifiedAwardsMember_8f3f7018-02a8-431b-a515-63a75fdd6303" xlink:href="rxt-20231231.xsd#rxt_LiabilityClassifiedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_rxt_LiabilityClassifiedAwardsMember_8f3f7018-02a8-431b-a515-63a75fdd6303" xlink:type="arc" order="11"/>
  </link:definitionLink>
</link:linkbase>
