To hold back; restrain; hinder from action, departure, or escape; keep back; detain.To hold or keep in possession; reserve as one's own.To continue in the use or practice of; preserve; keep up; keep from dying out: as, to retain a custom; to retain an appearance of youth.To keep in mind; preserve a knowledge or idea of; remember.To keep in pay; hire; take into service; especially, to engage by the payment of a preliminary fee: as, to retain counsel.To entertain.=Syn. 2–4. Reserve, Preserve, etc. See keep.To keep on: continue.To pertain; belong; be a dependent or retainer.