noun

1. a small room or cupboard for clothes, household supplies, linens, etc.
2. a small, private room for reading, meditation, etc.
3. a monarch's private chamber as for prayer or conference
4. water closet
5. a state of secrecy, esp. concerning personal homosexual orientation or activity: used with the

Etymology: OFr, small enclosure, dim. of clos: see close

adjective

1. private, secret, or clandestine a closet drinker
2. marked by theorizing; speculative closet thinking

transitive verb