clos·et / ˈkläzit/ • n. 1. a small room or cupboard used for storing things. ∎ archaic a small, private room used for prayer or study.2. archaic a toilet.3. (the closet) a state of secrecy or concealment, esp. about one's homosexuality: lesbians who had come out of the closet.• adj. secret; covert: a closet socialist.• v. (clos·et·ed, clos·et·ing) [tr.] (often be closeted) shut (someone) away, esp. in private conference or study. ∎ in a state of concealment, esp. about one's homosexuality.