(v. i.) To separate chaff from grain.

aerate air air out air-condition air-cool airify analyze appraise assess bolt catalog categorize choose out clarifier clarify class classify clear colander comb contradistinguish cordon cordon off cradle cribble cross-ventilate cull cull out decide between decrassify demarcate demark depurate differentiate discriminate distill distinguish divide draw the line edulcorate elute essentialize evaluate excerpt extract factor fan filter filtrate freshen gauge ghettoize gin glean group handpick identify insulate isolate keep apart keep aside lay aside leach lixiviate lixiviator make a selection mark the interface oxygenate oxygenize percolate percolator pick pick out purifier purify put aside quarantine rectify refine refiner refinery refresh riddle rocker ruffle screen screen out seclude segregate select separate set a limit set apart set aside set off sever severalize sieve sieve out sift sift out sifter single out sort sort out spiritualize split hairs strain strainer subdivide sublimate sublime subtilize thrash thrash out thresh try ventilate weigh wind winnowing basket winnowing fan winnowing machine