CLOSET

Any private area, (particularly) bowers in the open air.

Any private or inner room, (particularly):

A pew or side-chapel reserved for a monarch or other feudal lord.

To shut away for private discussion.

"The ambassador has been closeted with the prime minister all afternoon. We're all worried what will be announced when they exit."

To put into a private place for a secret interview or interrogation.

To shut up in, or as in, a closet for concealment or confinement.

Private.

Secret, (especially) with reference to gay people who are in the closet; closeted.