1) A-side 2) Entre nous 3) In camera 4) Inwardly 5) On the qt 6) Secretly 7) Subrosa 1) In camera 2) In private 
• (adv.) In a private manner; not openly; without the presence of others. • (adv.) In a manner affecting an individual; personally not officially; as, he is not privately benefited.
Pri'vate·ly (prī'vat*lȳ) adverb 1. In a private manner; not openly; without the presence of others. 2. In a manner affecting an individual; personally; not officially; as, he is not privately benefited. 
[adv] - by a private person or interest 2. [adv] - kept private or confined to those intimately concerned
privately 1. Kept private or confined to those intimately concerned: 'It was discussed privately between the two couples'. 2. Something done by a private person or interest. 3. Intended for or restricted to the use of a particular person, group, or class.
in private adverb kept private or confined to those intimately concerned; `it was discussed privately between the two men`; `privately, she thought differently`; `some member of his own party hoped privately for his defeat`; `he was questioned in priv...