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.

A private cabinet, (particularly):

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.