retardationretarded fallretarded motionretarding actionretartedretention periodreticular densityretractretractionretrenchretrieveretrograderetrograde sensereturnreturn on equityreturn on investmentreturn ratiorevenuerevenue accountrevenue taxreversalreversal cost methodreversereverse curvereverse lexicographicalreverse lexicographical orderreverse orderreverse processreverse the arrowsreverse to back toreversed sequencereverselyreversibereversibilityreversibility principlereversiblereversible embrittlementreversible enginereversionrevertreverting a seriesreviewrevise simplex methodrevised simplexrevised simplex algorithmrevisionrevivifyrevolutionrevolverevolving fund