closet

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A cabinet or enclosed recess for linens, household supplies, or clothing.
• noun A small private chamber, as for study or prayer.
• noun A water closet; a toilet.
• noun A state of secrecy or cautious privacy.
• transitive verb To enclose or shut up in a private room, as for discussion.
• adjective Private; confidential.
• adjective Being so or engaging only in private; secret.
• adjective Based on theory and speculation rather than practice.

from The Century Dictionary.

• To inclose or shut up, as in a closet or close compartment.
• To admit into or as into a closet, as for concealment or for private and confidential or clandestine consultation: used chiefly in the past participle.
• noun A small room or apartment for retirement; any room for privacy; a small supplementary apartment communicating with another, as a dressing-room with a bedroom; hence, in religious literature, the place or habit of devotional seclusion.
• noun A small side room or inclosed recess for storing utensils, clothing, provisions, curiosities, etc.
• noun A bedroom.
• noun A secret place; a place for the storing of precious things.
• noun An inclosed or inside part.
• noun In heraldry, a diminutive of the bar, one half of its width.
• Restricted, as to a closet; pertaining to or done in privacy or seclusion; suitable to or designed for private consideration or use; private; secluded: as, a closet conference or intrigue; closet reflections; a closet book or picture.
• Intimate; sharing one's privacy.
• Fitted only for seclusion or the privacy of a scholar; not adapted to the conditions of a practical life; merely theoretical; unpractical: as, a closet philosopher or theory.

from the GNU version of the Collaborative International Dictionary of English.

• noun A small room or apartment for retirement; a room for privacy.
• noun A small apartment, or recess in the side of a room, for household utensils, clothing, etc.
• noun sin commited in privacy.
• transitive verb rare To shut up in, or as in, a closet; to conceal.
• transitive verb To make into a closet for a secret interview.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A piece of furniture or a cabinet in which clothes or household supplies may be stored.
• noun A small private chamber.
• noun A toilet; a water closet.
• noun figuratively The imagined closet in idioms such as in the closet or skeleton in the closet, a place to keep things hidden.
• adjective Secret.
• verb transitive To shut away for private discussion.
• verb transitive To put into a private place for a secret interview or interrogation.
• verb transitive To shut up in, or as in, a closet for concealment or confinement.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb confine to a small space, as for intensive work
• noun a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
• noun a toilet in Britain
• noun a small private room for study or prayer
• noun a small room (or recess) or cabinet used for storage space