privy
noun.
a room or building equipped with one or more toilets
Synonym: toilet, lavatory, lav, john, can, bathroom
noun.
a small outbuilding with a bench having holes through which a user can defecate
Synonym: earth-closet, jakes, outhouse
adj.
hidden from general view or use
a privy place to rest and think|a secluded romantic spot|a secret garden
Synonym: secluded, secret
adj.
(followed by `to') informed about something secret or not generally known
privy to the details of the conspiracy