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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e69ff-4703-72bb-ab41-79dcbfb5e521,g:e2792029-0b15-40c8-b7e8-7d68eb70724c-->
<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://ralliant.com/role/CONSOLIDATEDANDCOMBINEDCONDENSEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="simple" xlink:href="ral-20260703.xsd#CONSOLIDATEDANDCOMBINEDCONDENSEDSTATEMENTSOFCHANGESINEQUITY"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/CONSOLIDATEDANDCOMBINEDCONDENSEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e69ff-485f-7211-ba9e-12946a97c59c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e69ff-485f-784c-8967-0b7a2d144f87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e69ff-485f-7211-ba9e-12946a97c59c" xlink:to="loc_us-gaap_StatementTable_019e69ff-485f-784c-8967-0b7a2d144f87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7cca-90a8-d850bbc1e285" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e69ff-485f-784c-8967-0b7a2d144f87" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7cca-90a8-d850bbc1e285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7cca-90a8-d850bbc1e285_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7cca-90a8-d850bbc1e285" xlink:to="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7cca-90a8-d850bbc1e285_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7cca-90a8-d850bbc1e285" xlink:to="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e69ff-485f-7ddc-aa36-2c118a9c30f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_us-gaap_CommonStockMember_019e69ff-485f-7ddc-aa36-2c118a9c30f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e69ff-485f-72d6-8d15-c8dcc4da17cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e69ff-485f-72d6-8d15-c8dcc4da17cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e69ff-485f-7659-a031-fa09f0fa5cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e69ff-485f-7659-a031-fa09f0fa5cc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e69ff-485f-7acd-81f7-ea36c3dd7e15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_us-gaap_RetainedEarningsMember_019e69ff-485f-7acd-81f7-ea36c3dd7e15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7e5c-9082-2cec171b8951" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7e5c-9082-2cec171b8951" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_NetFormerParentInvestmentMember_019e69ff-485f-77d6-9774-0b5e048936dc" xlink:href="ral-20260703.xsd#ral_NetFormerParentInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-79b4-bb60-b7d64984aed0" xlink:to="loc_ral_NetFormerParentInvestmentMember_019e69ff-485f-77d6-9774-0b5e048936dc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e69ff-485f-7211-ba9e-12946a97c59c" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e69ff-485f-716e-bd2a-853d48750840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019e69ff-485f-716e-bd2a-853d48750840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e69ff-485f-7fbc-adcd-f6474ba037b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_StockholdersEquity_019e69ff-485f-7fbc-adcd-f6474ba037b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e69ff-485f-72f0-b67a-4e71e071ad72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_NetIncomeLoss_019e69ff-485f-72f0-b67a-4e71e071ad72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_StockIssuedDuringPeriodSharesRecapitalization_019f02c9-41f5-774d-82d0-06430c956c2d" xlink:href="ral-20260703.xsd#ral_StockIssuedDuringPeriodSharesRecapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_ral_StockIssuedDuringPeriodSharesRecapitalization_019f02c9-41f5-774d-82d0-06430c956c2d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_StockIssuedDuringPeriodValueRecapitalization_019f02c9-55c2-7fa5-a895-86ff29629452" xlink:href="ral-20260703.xsd#ral_StockIssuedDuringPeriodValueRecapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_ral_StockIssuedDuringPeriodValueRecapitalization_019f02c9-55c2-7fa5-a895-86ff29629452" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_ConsiderationPaidToParentInConnectionWithTheSeparation_019f02c9-072a-721e-a9d5-4a55540f2adc" xlink:href="ral-20260703.xsd#ral_ConsiderationPaidToParentInConnectionWithTheSeparation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_ral_ConsiderationPaidToParentInConnectionWithTheSeparation_019f02c9-072a-721e-a9d5-4a55540f2adc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_NetTransfersFromToFormerParentNet_019e69ff-485f-7199-bf7d-ab3bdda1f7ba" xlink:href="ral-20260703.xsd#ral_NetTransfersFromToFormerParentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_ral_NetTransfersFromToFormerParentNet_019e69ff-485f-7199-bf7d-ab3bdda1f7ba" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e69ff-485f-7d8a-8d49-22711f0cc045" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e69ff-485f-7d8a-8d49-22711f0cc045" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019e69ff-485f-737d-9795-7ad435477bf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_DividendsCommonStock_019e69ff-485f-737d-9795-7ad435477bf0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e69ff-485f-703b-9a28-65803f3cba9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e69ff-485f-703b-9a28-65803f3cba9c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e69ff-485f-735b-8f58-f7c602a62f46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e69ff-485f-735b-8f58-f7c602a62f46" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019e69ff-485f-71f1-bffd-067f9e05d5e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019e69ff-485f-71f1-bffd-067f9e05d5e5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e69ff-485f-77ac-9461-0682d8d4fcad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e69ff-485f-77ac-9461-0682d8d4fcad" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e69ff-485f-7607-aa56-397e7ebacd57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e69ff-485f-7ceb-9e93-90dfba0331d2" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e69ff-485f-7607-aa56-397e7ebacd57" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019e69ff-485f-7457-838d-c97ab22efae4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e69ff-485f-715f-8d9a-acc69224c4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019f6a9d-93f3-70e6-9ca4-e7425d7d85e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e69ff-485f-7211-ba9e-12946a97c59c" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019f6a9d-93f3-70e6-9ca4-e7425d7d85e9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/GOODWILLDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#GOODWILLDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/GOODWILLDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019e69ff-485f-76b5-a4c4-ca416d28dec0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019e69ff-485f-7a2a-b970-b76d160b6703" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019e69ff-485f-76b5-a4c4-ca416d28dec0" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019e69ff-485f-7a2a-b970-b76d160b6703" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7f80-9435-e469a015a0cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019e69ff-485f-7a2a-b970-b76d160b6703" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7f80-9435-e469a015a0cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7f80-9435-e469a015a0cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7f80-9435-e469a015a0cd" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7f80-9435-e469a015a0cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7fb8-b3ce-8d7730bc4724" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7f80-9435-e469a015a0cd" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7fb8-b3ce-8d7730bc4724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-77d6-8333-ec3e0da1b359" xlink:href="ral-20260703.xsd#ral_SensorsAndSafetySystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7fb8-b3ce-8d7730bc4724" xlink:to="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-77d6-8333-ec3e0da1b359" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TestAndMeasurementMember_019e69ff-485f-7eed-aa92-66241a79ae29" xlink:href="ral-20260703.xsd#ral_TestAndMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7fb8-b3ce-8d7730bc4724" xlink:to="loc_ral_TestAndMeasurementMember_019e69ff-485f-7eed-aa92-66241a79ae29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019e69ff-485f-7fa9-92a4-c8605bb134d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019e69ff-485f-76b5-a4c4-ca416d28dec0" xlink:to="loc_us-gaap_GoodwillRollForward_019e69ff-485f-7fa9-92a4-c8605bb134d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e69ff-485f-760f-8901-18279a6f5a66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e69ff-485f-7fa9-92a4-c8605bb134d9" xlink:to="loc_us-gaap_Goodwill_019e69ff-485f-760f-8901-18279a6f5a66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e69ff-485f-7cd1-b0ad-7fd64848b160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e69ff-485f-7fa9-92a4-c8605bb134d9" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e69ff-485f-7cd1-b0ad-7fd64848b160" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e69ff-485f-752e-9e38-201fd19bf056" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/FAIRVALUEMEASUREMENTSScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#FAIRVALUEMEASUREMENTSScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/FAIRVALUEMEASUREMENTSScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e69ff-485f-7f79-af45-4069a3301d41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e69ff-485f-76b4-80f0-3d059bcd1fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e69ff-485f-7f79-af45-4069a3301d41" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e69ff-485f-76b4-80f0-3d059bcd1fe9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e69ff-485f-74ad-b341-8425e26e9e83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e69ff-485f-76b4-80f0-3d059bcd1fe9" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e69ff-485f-74ad-b341-8425e26e9e83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-74ad-b341-8425e26e9e83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e69ff-485f-74ad-b341-8425e26e9e83" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-74ad-b341-8425e26e9e83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-7727-b2b0-d51c193bd78d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e69ff-485f-74ad-b341-8425e26e9e83" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-7727-b2b0-d51c193bd78d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e69ff-485f-7cfe-8978-fcc2b3cbbd3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-7727-b2b0-d51c193bd78d" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e69ff-485f-7cfe-8978-fcc2b3cbbd3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e69ff-485f-75ce-8028-02afa1f162df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-7727-b2b0-d51c193bd78d" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e69ff-485f-75ce-8028-02afa1f162df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e69ff-485f-73ce-b77c-dc57e6f4b42c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e69ff-485f-7727-b2b0-d51c193bd78d" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e69ff-485f-73ce-b77c-dc57e6f4b42c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_DeferredCompensationLiabilitiesFairValueDisclosure_019e69ff-485f-7789-b3cd-47e4517712ed" xlink:href="ral-20260703.xsd#ral_DeferredCompensationLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e69ff-485f-7f79-af45-4069a3301d41" xlink:to="loc_ral_DeferredCompensationLiabilitiesFairValueDisclosure_019e69ff-485f-7789-b3cd-47e4517712ed" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/FINANCINGScheduleofComponentsofLongTermDebtDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#FINANCINGScheduleofComponentsofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/FINANCINGScheduleofComponentsofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-730c-853d-4584d52ab188" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-730c-853d-4584d52ab188" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-79e4-8736-7297dbde1e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-730c-853d-4584d52ab188" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-79e4-8736-7297dbde1e6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-79e4-8736-7297dbde1e6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-79e4-8736-7297dbde1e6a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-79e4-8736-7297dbde1e6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-7000-8947-9729e11f93b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-79e4-8736-7297dbde1e6a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-7000-8947-9729e11f93b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_USDTermLoanDueMarch2029Member_019e69ff-485f-7882-8f6a-aa1cc083ae2b" xlink:href="ral-20260703.xsd#ral_USDTermLoanDueMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-7000-8947-9729e11f93b8" xlink:to="loc_ral_USDTermLoanDueMarch2029Member_019e69ff-485f-7882-8f6a-aa1cc083ae2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_USDTermLoanDueJune2028Member_019e69ff-485f-72ae-b560-43a722221d56" xlink:href="ral-20260703.xsd#ral_USDTermLoanDueJune2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-7000-8947-9729e11f93b8" xlink:to="loc_ral_USDTermLoanDueJune2028Member_019e69ff-485f-72ae-b560-43a722221d56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7890-987d-15a4ec1dfdc4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-730c-853d-4584d52ab188" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7890-987d-15a4ec1dfdc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7890-987d-15a4ec1dfdc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7890-987d-15a4ec1dfdc4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7890-987d-15a4ec1dfdc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7e70-b37b-9434ea529814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7890-987d-15a4ec1dfdc4" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7e70-b37b-9434ea529814" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DelayedDrawTermLoanMember_019e69ff-485f-71df-927e-f24c53529429" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7e70-b37b-9434ea529814" xlink:to="loc_us-gaap_DelayedDrawTermLoanMember_019e69ff-485f-71df-927e-f24c53529429" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e69ff-485f-7bae-a2bc-78b4ed10a554" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e69ff-485f-7bae-a2bc-78b4ed10a554" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e69ff-485f-7881-b77c-a0b360f792d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e69ff-485f-7881-b77c-a0b360f792d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e69ff-485f-72c2-9bbd-6035abdb6969" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019e69ff-485f-72c2-9bbd-6035abdb6969" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e69ff-485f-760c-856c-f8cfbffd906a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_LongTermDebt_019e69ff-485f-760c-856c-f8cfbffd906a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019e69ff-485f-7cc6-9539-8d12c04c5883" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_LongTermDebtCurrent_019e69ff-485f-7cc6-9539-8d12c04c5883" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019e69ff-485f-7655-a270-353957fa73d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7172-867d-9c12b2836e93" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019e69ff-485f-7655-a270-353957fa73d8" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/FINANCINGNarrativeDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#FINANCINGNarrativeDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/FINANCINGNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7050-8b7a-a56373666d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-7817-b9ef-5bf35a2c2764" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7050-8b7a-a56373666d6c" xlink:to="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-7817-b9ef-5bf35a2c2764" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-778f-8966-21b38e2de537" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-7817-b9ef-5bf35a2c2764" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-778f-8966-21b38e2de537" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-778f-8966-21b38e2de537_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-778f-8966-21b38e2de537" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-778f-8966-21b38e2de537_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-729e-ad12-87cd152cc7ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e69ff-485f-778f-8966-21b38e2de537" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-729e-ad12-87cd152cc7ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_USDTermLoanDueMarch2029Member_019e69ff-485f-737a-aa3a-e118e1b2df05" xlink:href="ral-20260703.xsd#ral_USDTermLoanDueMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-729e-ad12-87cd152cc7ee" xlink:to="loc_ral_USDTermLoanDueMarch2029Member_019e69ff-485f-737a-aa3a-e118e1b2df05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_USDTermLoanDueJune2028Member_019e69ff-485f-7a76-87fa-0334c699c6dd" xlink:href="ral-20260703.xsd#ral_USDTermLoanDueJune2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e69ff-485f-729e-ad12-87cd152cc7ee" xlink:to="loc_ral_USDTermLoanDueJune2028Member_019e69ff-485f-7a76-87fa-0334c699c6dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7408-b98f-49127c08830d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e69ff-485f-7817-b9ef-5bf35a2c2764" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7408-b98f-49127c08830d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7408-b98f-49127c08830d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7408-b98f-49127c08830d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7408-b98f-49127c08830d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7b2d-87e1-2480544c20fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e69ff-485f-7408-b98f-49127c08830d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7b2d-87e1-2480544c20fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DelayedDrawTermLoanMember_019e69ff-485f-7e25-924f-508bd6374611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e69ff-485f-7b2d-87e1-2480544c20fb" xlink:to="loc_us-gaap_DelayedDrawTermLoanMember_019e69ff-485f-7e25-924f-508bd6374611" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e69ff-485f-7ba5-a36b-70bea6a8f181" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7050-8b7a-a56373666d6c" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e69ff-485f-7ba5-a36b-70bea6a8f181" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecreaseInBasisPoints_019e69ff-485f-79a9-8e4f-2e2a44a9c892" xlink:href="ral-20260703.xsd#ral_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecreaseInBasisPoints"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7050-8b7a-a56373666d6c" xlink:to="loc_ral_DebtInstrumentBasisSpreadOnVariableRateIncreaseDecreaseInBasisPoints_019e69ff-485f-79a9-8e4f-2e2a44a9c892" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_CashAndCashEquivalentsNetLeverageCalculationCapPercentage_019e69ff-485f-7b6a-87eb-8a9a8d2e10e4" xlink:href="ral-20260703.xsd#ral_CashAndCashEquivalentsNetLeverageCalculationCapPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e69ff-485f-7050-8b7a-a56373666d6c" xlink:to="loc_ral_CashAndCashEquivalentsNetLeverageCalculationCapPercentage_019e69ff-485f-7b6a-87eb-8a9a8d2e10e4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMEDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMEDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMEDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e69ff-485f-7c63-98d3-d8b4149df643" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e69ff-485f-79e5-9296-1170f58f8f57" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e69ff-485f-7c63-98d3-d8b4149df643" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e69ff-485f-79e5-9296-1170f58f8f57" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7983-b260-68f7e17c8b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e69ff-485f-79e5-9296-1170f58f8f57" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7983-b260-68f7e17c8b1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7983-b260-68f7e17c8b1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7983-b260-68f7e17c8b1c" xlink:to="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7983-b260-68f7e17c8b1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7d49-b601-08994dcab0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e69ff-485f-7983-b260-68f7e17c8b1c" xlink:to="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7d49-b601-08994dcab0dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7fff-81fd-59f31cda2ad5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e69ff-485f-7d49-b601-08994dcab0dc" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7fff-81fd-59f31cda2ad5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e69ff-485f-7991-9010-9994af0f01c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7fff-81fd-59f31cda2ad5" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e69ff-485f-7991-9010-9994af0f01c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e69ff-485f-7a86-949f-6c7aba9c16f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e69ff-485f-7fff-81fd-59f31cda2ad5" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e69ff-485f-7a86-949f-6c7aba9c16f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e69ff-485f-7c63-98d3-d8b4149df643" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e69ff-485f-7ecc-a604-afeef1d90e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:to="loc_us-gaap_StockholdersEquity_019e69ff-485f-7ecc-a604-afeef1d90e45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e69ff-485f-7d49-ba3f-31fc914d46ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e69ff-485f-7d49-ba3f-31fc914d46ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_019e69ff-485f-77f0-bf56-0ede45f28ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e69ff-485f-7d49-ba3f-31fc914d46ea" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_019e69ff-485f-77f0-bf56-0ede45f28ae6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e69ff-485f-7e3c-bce6-d38d8c62bf15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e69ff-485f-7d49-ba3f-31fc914d46ea" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e69ff-485f-7e3c-bce6-d38d8c62bf15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019e69ff-485f-7de2-bcd1-55cc3136fc30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_019e69ff-485f-7d49-ba3f-31fc914d46ea" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019e69ff-485f-7de2-bcd1-55cc3136fc30" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e69ff-485f-77b4-a020-2f1a4db0b4e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e69ff-485f-77b4-a020-2f1a4db0b4e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_019e69ff-485f-7a6b-855f-46be087a0636" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e69ff-485f-77b4-a020-2f1a4db0b4e1" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_019e69ff-485f-7a6b-855f-46be087a0636" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e69ff-485f-7a0f-92f4-1a0ecf88c93d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e69ff-485f-77b4-a020-2f1a4db0b4e1" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e69ff-485f-7a0f-92f4-1a0ecf88c93d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019e69ff-485f-7e15-9143-7f961f3b62b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodTaxAbstract_019e69ff-485f-77b4-a020-2f1a4db0b4e1" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019e69ff-485f-7e15-9143-7f961f3b62b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e69ff-485f-7d90-ac37-c418ef3d4009" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019e69ff-485f-70af-882d-37f41ec65401" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e69ff-485f-7d90-ac37-c418ef3d4009" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e69ff-485f-7be1-bfad-15f2f32fc8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/SALESNarrativeDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#SALESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/SALESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7e17-b085-84a91ac7fdf3_default" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7e17-b085-84a91ac7fdf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodOneMember_019e69ff-485f-7e6a-bd9f-edd7287deaa2" xlink:href="ral-20260703.xsd#ral_PeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodOneMember_019e69ff-485f-7e6a-bd9f-edd7287deaa2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodTwoMember_019e69ff-485f-7341-b14a-e6a97ec35abd" xlink:href="ral-20260703.xsd#ral_PeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodTwoMember_019e69ff-485f-7341-b14a-e6a97ec35abd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodThreeMember_019e69ff-485f-7648-97d3-577367baa2b6" xlink:href="ral-20260703.xsd#ral_PeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodThreeMember_019e69ff-485f-7648-97d3-577367baa2b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e69ff-485f-7f12-a600-8a5964c113fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e69ff-485f-7f12-a600-8a5964c113fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e69ff-485f-75e0-908c-420bfa03f0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e69ff-485f-75e0-908c-420bfa03f0d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e69ff-485f-7196-aeb3-13197d9dde3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e69ff-485f-7196-aeb3-13197d9dde3e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/SALESNarrativeDetails_1" xlink:type="simple" xlink:href="ral-20260703.xsd#SALESNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/SALESNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-765e-9e6f-5361ee6d319d" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7e17-b085-84a91ac7fdf3_default" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7e17-b085-84a91ac7fdf3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:href="ral-20260703.xsd#ral_RevenueRemainingPerformanceObligationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodAxis_019e69ff-485f-7e17-b085-84a91ac7fdf3" xlink:to="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodOneMember_019e69ff-485f-7e6a-bd9f-edd7287deaa2" xlink:href="ral-20260703.xsd#ral_PeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodOneMember_019e69ff-485f-7e6a-bd9f-edd7287deaa2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodTwoMember_019e69ff-485f-7341-b14a-e6a97ec35abd" xlink:href="ral-20260703.xsd#ral_PeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodTwoMember_019e69ff-485f-7341-b14a-e6a97ec35abd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_PeriodThreeMember_019e69ff-485f-7648-97d3-577367baa2b6" xlink:href="ral-20260703.xsd#ral_PeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_RevenueRemainingPerformanceObligationPeriodDomain_019e69ff-485f-7ecd-9e86-2089975cd018" xlink:to="loc_ral_PeriodThreeMember_019e69ff-485f-7648-97d3-577367baa2b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e69ff-485f-75e0-908c-420bfa03f0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e69ff-485f-75e0-908c-420bfa03f0d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e69ff-485f-7196-aeb3-13197d9dde3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-775e-90f4-17ad59b8f8ed" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e69ff-485f-7196-aeb3-13197d9dde3e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/SALESScheduleofRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#SALESScheduleofRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/SALESScheduleofRemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-766c-8f90-28c59a0e4485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-7b5d-8a00-b36d74871642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-766c-8f90-28c59a0e4485" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-7b5d-8a00-b36d74871642" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-75ae-a446-09ec89d5b91e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e69ff-485f-7b5d-8a00-b36d74871642" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-75ae-a446-09ec89d5b91e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-75ae-a446-09ec89d5b91e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-75ae-a446-09ec89d5b91e" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-75ae-a446-09ec89d5b91e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-73ca-93c0-29df16caa9a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-75ae-a446-09ec89d5b91e" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-73ca-93c0-29df16caa9a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TestAndMeasurementMember_019e69ff-485f-7cb9-83e2-8b715286fbc3" xlink:href="ral-20260703.xsd#ral_TestAndMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-73ca-93c0-29df16caa9a6" xlink:to="loc_ral_TestAndMeasurementMember_019e69ff-485f-7cb9-83e2-8b715286fbc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7c02-8248-78526dd382b3" xlink:href="ral-20260703.xsd#ral_SensorsAndSafetySystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-73ca-93c0-29df16caa9a6" xlink:to="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7c02-8248-78526dd382b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e69ff-485f-75b2-9f94-90c1b0c44ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e69ff-485f-766c-8f90-28c59a0e4485" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e69ff-485f-75b2-9f94-90c1b0c44ed0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/SALESScheduleofDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#SALESScheduleofDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/SALESScheduleofDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e69ff-485f-7350-8816-4156237c1571" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e69ff-485f-79b2-8a01-54591d6bb77f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e69ff-485f-7350-8816-4156237c1571" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e69ff-485f-79b2-8a01-54591d6bb77f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e69ff-485f-7eb4-9102-b9f6c56cbd79" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e69ff-485f-79b2-8a01-54591d6bb77f" xlink:to="loc_srt_StatementGeographicalAxis_019e69ff-485f-7eb4-9102-b9f6c56cbd79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7eb4-9102-b9f6c56cbd79_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019e69ff-485f-7eb4-9102-b9f6c56cbd79" xlink:to="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7eb4-9102-b9f6c56cbd79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7d7b-b072-4009678e655a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019e69ff-485f-7eb4-9102-b9f6c56cbd79" xlink:to="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7d7b-b072-4009678e655a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e69ff-485f-756c-b61c-4079ee7daffb" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7d7b-b072-4009678e655a" xlink:to="loc_country_US_019e69ff-485f-756c-b61c-4079ee7daffb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019e69ff-485f-70f7-b8d2-994d47d886a7" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7d7b-b072-4009678e655a" xlink:to="loc_country_CN_019e69ff-485f-70f7-b8d2-994d47d886a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_OtherGeographicalLocationsMember_019e69ff-485f-7655-8cfc-5a6509197cfe" xlink:href="ral-20260703.xsd#ral_OtherGeographicalLocationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e69ff-485f-7d7b-b072-4009678e655a" xlink:to="loc_ral_OtherGeographicalLocationsMember_019e69ff-485f-7655-8cfc-5a6509197cfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7515-a0c3-08400412ea84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e69ff-485f-79b2-8a01-54591d6bb77f" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7515-a0c3-08400412ea84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7515-a0c3-08400412ea84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7515-a0c3-08400412ea84" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7515-a0c3-08400412ea84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7c2a-b7f2-7b48e1ed44bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7515-a0c3-08400412ea84" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7c2a-b7f2-7b48e1ed44bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7521-b479-1673c6d4c0c3" xlink:href="ral-20260703.xsd#ral_SensorsAndSafetySystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7c2a-b7f2-7b48e1ed44bc" xlink:to="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7521-b479-1673c6d4c0c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TestAndMeasurementMember_019e69ff-485f-7957-8d0f-b9b641f1efc4" xlink:href="ral-20260703.xsd#ral_TestAndMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7c2a-b7f2-7b48e1ed44bc" xlink:to="loc_ral_TestAndMeasurementMember_019e69ff-485f-7957-8d0f-b9b641f1efc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_EndMarketAxis_019e69ff-485f-7033-ad57-dd388d852a50" xlink:href="ral-20260703.xsd#ral_EndMarketAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e69ff-485f-79b2-8a01-54591d6bb77f" xlink:to="loc_ral_EndMarketAxis_019e69ff-485f-7033-ad57-dd388d852a50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_EndMarketDomain_019e69ff-485f-7033-ad57-dd388d852a50_default" xlink:href="ral-20260703.xsd#ral_EndMarketDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ral_EndMarketAxis_019e69ff-485f-7033-ad57-dd388d852a50" xlink:to="loc_ral_EndMarketDomain_019e69ff-485f-7033-ad57-dd388d852a50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:href="ral-20260703.xsd#ral_EndMarketDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ral_EndMarketAxis_019e69ff-485f-7033-ad57-dd388d852a50" xlink:to="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_IndustrialManufacturingMember_019e69ff-485f-7e75-a108-2a7b071eaf13" xlink:href="ral-20260703.xsd#ral_IndustrialManufacturingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_IndustrialManufacturingMember_019e69ff-485f-7e75-a108-2a7b071eaf13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_DefenseAndSpaceMember_019e69ff-485f-773c-853a-40a435a18fa1" xlink:href="ral-20260703.xsd#ral_DefenseAndSpaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_DefenseAndSpaceMember_019e69ff-485f-773c-853a-40a435a18fa1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_UtilitiesMember_019e69ff-485f-7068-bab4-766221165aee" xlink:href="ral-20260703.xsd#ral_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_UtilitiesMember_019e69ff-485f-7068-bab4-766221165aee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_OtherDirectEndMarketsMember_019e69ff-485f-7dc0-8ce4-b8cc8245c906" xlink:href="ral-20260703.xsd#ral_OtherDirectEndMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_OtherDirectEndMarketsMember_019e69ff-485f-7dc0-8ce4-b8cc8245c906" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_DiversifiedElectronicsMember_019e69ff-485f-7adb-b2fe-9046851db467" xlink:href="ral-20260703.xsd#ral_DiversifiedElectronicsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_DiversifiedElectronicsMember_019e69ff-485f-7adb-b2fe-9046851db467" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_CommunicationsMember_019e69ff-485f-7edc-8241-1e3ac72bf6b1" xlink:href="ral-20260703.xsd#ral_CommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_CommunicationsMember_019e69ff-485f-7edc-8241-1e3ac72bf6b1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_SemiconductorsMember_019e69ff-485f-786b-a335-ab9d9e4aad05" xlink:href="ral-20260703.xsd#ral_SemiconductorsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ral_EndMarketDomain_019e69ff-485f-7444-a8b9-7f0a7dd3707b" xlink:to="loc_ral_SemiconductorsMember_019e69ff-485f-786b-a335-ab9d9e4aad05" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e69ff-485f-78fb-b1ed-cb34fdf88f44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e69ff-485f-7350-8816-4156237c1571" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e69ff-485f-78fb-b1ed-cb34fdf88f44" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/NETEARNINGSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#NETEARNINGSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/NETEARNINGSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramTable_019f6a83-f8f4-7338-bb8c-c921d52cf963" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_srt_ShareRepurchaseProgramTable_019f6a83-f8f4-7338-bb8c-c921d52cf963" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019f6a83-f8f4-7d86-bf10-1cb2f67158b7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ShareRepurchaseProgramTable_019f6a83-f8f4-7338-bb8c-c921d52cf963" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019f6a83-f8f4-7d86-bf10-1cb2f67158b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019f6a83-f8f4-7d86-bf10-1cb2f67158b7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019f6a83-f8f4-7d86-bf10-1cb2f67158b7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019f6a83-f8f4-7d86-bf10-1cb2f67158b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019f6a83-f8f4-7f71-a575-a889e1bc1008" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019f6a83-f8f4-7d86-bf10-1cb2f67158b7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019f6a83-f8f4-7f71-a575-a889e1bc1008" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_AcceleratedShareRepurchaseAgreementMember_019f6a83-f8f4-7618-9d20-501a3a1a96a3" xlink:href="ral-20260703.xsd#ral_AcceleratedShareRepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019f6a83-f8f4-7f71-a575-a889e1bc1008" xlink:to="loc_ral_AcceleratedShareRepurchaseAgreementMember_019f6a83-f8f4-7618-9d20-501a3a1a96a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e69ff-485f-7674-9177-7953d752bb32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e69ff-485f-7674-9177-7953d752bb32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e69ff-485f-7751-9c12-ba03264de33a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e69ff-485f-7751-9c12-ba03264de33a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e69ff-485f-77ba-a181-61d651bddef5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019e69ff-485f-77ba-a181-61d651bddef5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019e69ff-485f-7d7f-9a9c-0273e186ca14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019e69ff-485f-7d7f-9a9c-0273e186ca14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019e69ff-485f-728a-a65d-ec72228d981a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019e69ff-485f-728a-a65d-ec72228d981a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e69ff-485f-7931-85e2-31d7272fb9cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e69ff-485f-7931-85e2-31d7272fb9cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_ShareRepurchaseProgramExciseTaxesAndFees_019f8faf-a179-7110-b477-db37054a5ece" xlink:href="ral-20260703.xsd#ral_ShareRepurchaseProgramExciseTaxesAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_ral_ShareRepurchaseProgramExciseTaxesAndFees_019f8faf-a179-7110-b477-db37054a5ece" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramExciseTax_019f8faf-2e1c-72b4-bbdc-8d5fc3bf044c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareRepurchaseProgramExciseTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_ShareRepurchaseProgramExciseTax_019f8faf-2e1c-72b4-bbdc-8d5fc3bf044c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e69ff-485f-7d06-823a-88c6d585a2e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramLineItems_019f6a83-f8f4-71ca-8e20-0dd38ef15659" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019e69ff-485f-7d06-823a-88c6d585a2e2" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/SEGMENTINFORMATIONScheduleofSegmentReportingInformationDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#SEGMENTINFORMATIONScheduleofSegmentReportingInformationDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/SEGMENTINFORMATIONScheduleofSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e69ff-485f-7feb-9966-82cce6bf074a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e69ff-485f-7feb-9966-82cce6bf074a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e69ff-485f-737f-b082-6a924c3b45e1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e69ff-485f-7feb-9966-82cce6bf074a" xlink:to="loc_srt_ConsolidationItemsAxis_019e69ff-485f-737f-b082-6a924c3b45e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e69ff-485f-737f-b082-6a924c3b45e1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e69ff-485f-737f-b082-6a924c3b45e1" xlink:to="loc_srt_ConsolidationItemsDomain_019e69ff-485f-737f-b082-6a924c3b45e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e69ff-485f-7727-b795-0760f0491414" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e69ff-485f-737f-b082-6a924c3b45e1" xlink:to="loc_srt_ConsolidationItemsDomain_019e69ff-485f-7727-b795-0760f0491414" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e69ff-485f-7687-a366-d585f68c864a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e69ff-485f-7727-b795-0760f0491414" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e69ff-485f-7687-a366-d585f68c864a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_CorporateAndReconcilingItemsMember_019e69ff-485f-7f9e-a361-b095ed99f807" xlink:href="ral-20260703.xsd#ral_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e69ff-485f-7727-b795-0760f0491414" xlink:to="loc_ral_CorporateAndReconcilingItemsMember_019e69ff-485f-7f9e-a361-b095ed99f807" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e69ff-485f-787c-b4ed-e67e7dcb1052" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e69ff-485f-7727-b795-0760f0491414" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e69ff-485f-787c-b4ed-e67e7dcb1052" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7864-b68f-c791a524f353" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e69ff-485f-7feb-9966-82cce6bf074a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7864-b68f-c791a524f353" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7864-b68f-c791a524f353_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7864-b68f-c791a524f353" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7864-b68f-c791a524f353_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e69ff-485f-7569-b8d9-8722f4359cac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e69ff-485f-7864-b68f-c791a524f353" xlink:to="loc_us-gaap_SegmentDomain_019e69ff-485f-7569-b8d9-8722f4359cac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7a14-915f-4e7e31ae7899" xlink:href="ral-20260703.xsd#ral_SensorsAndSafetySystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7569-b8d9-8722f4359cac" xlink:to="loc_ral_SensorsAndSafetySystemsMember_019e69ff-485f-7a14-915f-4e7e31ae7899" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TestAndMeasurementMember_019e69ff-485f-7a40-92cf-ffa69d595d25" xlink:href="ral-20260703.xsd#ral_TestAndMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e69ff-485f-7569-b8d9-8722f4359cac" xlink:to="loc_ral_TestAndMeasurementMember_019e69ff-485f-7a40-92cf-ffa69d595d25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e69ff-485f-75b0-90d1-b5cef7fe3db0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e69ff-485f-75b0-90d1-b5cef7fe3db0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019e69ff-485f-701a-b527-51602c6dee34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019e69ff-485f-701a-b527-51602c6dee34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e69ff-485f-76b4-9584-a3b6a3307e66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_OperatingExpenses_019e69ff-485f-76b4-9584-a3b6a3307e66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019e69ff-485f-7c60-b235-6ac893064c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_OperatingIncomeLoss_019e69ff-485f-7c60-b235-6ac893064c0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e69ff-485f-769c-82d0-cd016ffc4659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e69ff-485f-769c-82d0-cd016ffc4659" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019e69ff-485f-7741-baa7-719d5d15ba47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e69ff-485f-769c-82d0-cd016ffc4659" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019e69ff-485f-7741-baa7-719d5d15ba47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019e69ff-485f-753f-9e9b-bf045912ad2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e69ff-485f-769c-82d0-cd016ffc4659" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019e69ff-485f-753f-9e9b-bf045912ad2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e69ff-485f-71d6-bba2-dcaff4dd1fae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e69ff-485f-769c-82d0-cd016ffc4659" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e69ff-485f-71d6-bba2-dcaff4dd1fae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e69ff-485f-7a34-b16a-010dc502d2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e69ff-485f-7a34-b16a-010dc502d2aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e69ff-485f-7cbd-a004-02c81fd9fc5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e69ff-485f-7cbd-a004-02c81fd9fc5a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e69ff-485f-7404-8948-712cf86f72c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e69ff-485f-7751-b575-c56e6c8384da" xlink:to="loc_us-gaap_Assets_019e69ff-485f-7404-8948-712cf86f72c0" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/RELATEDPARTYTRANSACTIONSNarrativeDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#RELATEDPARTYTRANSACTIONSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/RELATEDPARTYTRANSACTIONSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-766d-b6d5-e63e18ca841f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-781c-bec3-06bac5f8e21f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-766d-b6d5-e63e18ca841f" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-781c-bec3-06bac5f8e21f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-7c59-945c-e6683e490354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-781c-bec3-06bac5f8e21f" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-7c59-945c-e6683e490354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7c59-945c-e6683e490354_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-7c59-945c-e6683e490354" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7c59-945c-e6683e490354_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-725a-999a-33cd7862e9ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-7c59-945c-e6683e490354" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-725a-999a-33cd7862e9ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TaxMattersAgreementMember_019e69ff-485f-750a-a472-b8be0ae13b76" xlink:href="ral-20260703.xsd#ral_TaxMattersAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-725a-999a-33cd7862e9ec" xlink:to="loc_ral_TaxMattersAgreementMember_019e69ff-485f-750a-a472-b8be0ae13b76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e69ff-485f-7164-ae94-1c333b7ef3bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-766d-b6d5-e63e18ca841f" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e69ff-485f-7164-ae94-1c333b7ef3bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_RelatedPartyTransactionAmountPaid_019e69ff-485f-7955-928e-ac78ecdbd5a9" xlink:href="ral-20260703.xsd#ral_RelatedPartyTransactionAmountPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-766d-b6d5-e63e18ca841f" xlink:to="loc_ral_RelatedPartyTransactionAmountPaid_019e69ff-485f-7955-928e-ac78ecdbd5a9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://ralliant.com/role/RELATEDPARTYTRANSACTIONSScheduleofRelatedPartyExpensesDetails" xlink:type="simple" xlink:href="ral-20260703.xsd#RELATEDPARTYTRANSACTIONSScheduleofRelatedPartyExpensesDetails"/>
  <link:definitionLink xlink:role="http://ralliant.com/role/RELATEDPARTYTRANSACTIONSScheduleofRelatedPartyExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-7cd9-b94e-7013c2951961" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-72ce-9c01-b3a237a729bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-7cd9-b94e-7013c2951961" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-72ce-9c01-b3a237a729bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-74fe-9a93-db9477f74098" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e69ff-485f-72ce-9c01-b3a237a729bd" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-74fe-9a93-db9477f74098" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-74fe-9a93-db9477f74098_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-74fe-9a93-db9477f74098" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-74fe-9a93-db9477f74098_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e69ff-485f-74fe-9a93-db9477f74098" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_AllocatedCorporateExpensesMember_019e69ff-485f-7e7d-beb5-de34843e23b3" xlink:href="ral-20260703.xsd#ral_AllocatedCorporateExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:to="loc_ral_AllocatedCorporateExpensesMember_019e69ff-485f-7e7d-beb5-de34843e23b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_InsuranceProgramExpensesMember_019e69ff-485f-7df4-91a1-b309345a7777" xlink:href="ral-20260703.xsd#ral_InsuranceProgramExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:to="loc_ral_InsuranceProgramExpensesMember_019e69ff-485f-7df4-91a1-b309345a7777" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_MedicalInsuranceProgramExpensesMember_019e69ff-485f-78f2-9222-092120d03171" xlink:href="ral-20260703.xsd#ral_MedicalInsuranceProgramExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:to="loc_ral_MedicalInsuranceProgramExpensesMember_019e69ff-485f-78f2-9222-092120d03171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_DeferredCompensationProgramExpensesMember_019e69ff-485f-70b4-b5e0-e42b2af902ca" xlink:href="ral-20260703.xsd#ral_DeferredCompensationProgramExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e69ff-485f-7e53-b508-01091d9be837" xlink:to="loc_ral_DeferredCompensationProgramExpensesMember_019e69ff-485f-70b4-b5e0-e42b2af902ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e69ff-485f-7137-b8ea-6a297797e49c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e69ff-485f-7cd9-b94e-7013c2951961" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019e69ff-485f-7137-b8ea-6a297797e49c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_ral_TamaraNewcombeMember_019f82ac-7c13-7536-8e70-6fdb210a1a8e" xlink:href="ral-20260703.xsd#ral_TamaraNewcombeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_ral_TamaraNewcombeMember_019f82ac-7c13-7536-8e70-6fdb210a1a8e" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
