retells retentate retention retention agent retention aid retention and destruction retention and disposal retention and disposition retention and drainage retention as retention basin retention can retention capacity retention clip retention component retention components retention device retention devices retention directive retention element retention elements retention force retention in the body retention may retention mechanism retention member retention members retention money retention monies retention of data retention of information retention of personal retention of records retention of title retention of water retention period retention periods retention policies retention policy retention program retention properties retention rate retention rates retention requirements retention ring retention schedule retention strategies retention strategy retention structure retention system retention systems retention tank retention test retention time retention times retention unit retention volume retentionist retentions reteplase retest retested retesting retex retezat rethel rethink rethink everything rethink how rethink how you rethink robotics rethink the way rethink things rethinking rethinking development rethinking education rethinking it rethinking the role rethinking what rethinks rethought rethymno rethymnon reticence reticent reticle reticles reticular reticular formation reticulata reticulate reticulated reticulated foam reticulated python reticulation reticulatus reticuli reticulocyte reticulocyte count