To unfasten; disunite; disengage and separate, as one thing from another: as, to detach a locomotive from a train; to detach a rock from its bed; to detach the seal from a document; to detach a man from his party.To separate for a special purpose or service; send away, as from a post of duty or a larger body, on a distinct mission: chiefly in military use: as, to detach a ship or a regiment for some special duty; to detach an officer from a ship or station.Synonyms To sever, withdraw, draw off, disjoin, disconnect unhitch.To detail.To become detached or separated; separate or disunite itself or one's self.