Apart; asunder: used only in the adverbial phrase on sunder, in sunder, now reduced to asunder, apart, in which, in the fuller form, sunder assumes the aspect of a noun.To part; separate; keep apart; divide; sever; disunite in any manner, as by natural conditions (as of location), opening, rending, cutting, breaking, etc.Synonyms To disjoin, disconnect, sever, dissever, dissociate.To part; be separated; quit each other; be severed.To expose to or dry in the sun, as hay.