early 13c., "secret, concealed, not made known in public;" c. 1300, of places, "secluded," from Old French privé "friendly, intimate; a private place," from Latin privatus "private, personal" (see private (adj.)). Meaning "participating in (a secret)" (usually with to) is attested from late 14c. Related: Privily. Privy Council is from c. 1300 in a general sense; specifically of the British government, first attested late 14c. (with French word order) as consaile priue. Privy member "organ of sex" is from late 13c.
"latrine, outdoor toilet in a small shed, outhouse," c. 1200, from Old French privé, privee "latrine," literally "private place," from noun use of adjective privé (see privy (adj.)).