1. [adjective] (now chiefly historical) Private, exclusive; not public; one's own.
2. [adjective] (now rare) (archaic) Secret, hidden, concealed.
3. [adjective] With knowledge of; party to; let in on.
4. [noun] An outdoor toilet; latrine; earth closet; john; johnny house.
5. [noun] (legal) A partaker; one having an interest in an action, contract, etc. to which he is not himself a party.
6. [noun] A room or building equipped with one or more toilets.
7. [noun] A small outbuilding with a bench having holes through which a user can defecate.
8. [adjective] Hidden from general view or use; 'a privy place to rest and think'; 'a secluded romantic spot'; 'a secret garden'.
9. [adjective] (followed by `to') informed about something secret or not generally known; 'privy to the details of the conspiracy'.