Merriam-Webster Collegiate Dictionary - privily

 adverb see privy I PRIVITY  noun  (plural -ties)  Etymology: Middle English privite privacy, secret, from Anglo-French privete, from Medieval Latin privitat-, privatas, from Latin privus private — more at private  Date: 1523  1.  a. a relationship between persons who successively have a legal interest in the same right or property  b. an interest in a transaction, contract, or legal action to which one is not a party arising out of a relationship to one of the parties  2. private or joint knowledge of a private matter; especially cognizance implying concurrence