adjective, privier, priviest.
participating in the knowledge of something private or secret (usually followed by to ): Many persons were privy to the plot.
private; assigned to private uses.
belonging or pertaining to some particular person, especially with reference to a sovereign.
secret, concealed, hidden, or secluded.
acting or done in secret.
noun, plural privies.
outhouse ( def 1 ).
Law. a person participating directly in or having a derivative interest in a legal transaction.

1175–1225; Middle English prive < Old French: private (adj.), close friend, private place (noun) < Latin prīvātus private Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
privy (ˈprɪvɪ)
adj (foll by to) , privier, priviest
1.  participating in the knowledge of something secret
2.  archaic secret, hidden, etc
3.  archaic of or relating to one person only
n , privier, priviest, privies
4.  a lavatory, esp an outside one
5.  law See privity a person in privity with another
[C13: from Old French privé something private, from Latin prīvātusprivate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"private," early 13c., from O.Fr. privé, from L. privatus (see private). Meaning "participating in a secret" (usually with to) is attested from late 14c. The noun meaning "toilet" is early 13c., from O.Fr. privé, from the adj. Privy Council is from c.1300 in
a general sense; specifically of the British government, first attested late 14c., as consaile priue.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People I talked with here get it — they know they're not privy to all the
  information online.
And everyone, it seems, has secrets — secrets to which even the actors
  aren't privy until each script arrives.
But it's safe to suggest that very few are privy to any real actual battle plan
  that's being drawn.
Astor was not privy to the letter or the telephone conversations about the
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