Pronunciation: (kon"fi-den'shul),[key] —adj. 1. spoken, written, acted on, etc., in strict privacy or secrecy; secret: a confidential remark. 2. indicating confidence or intimacy; imparting private matters: a confidential tone of voice. 3. having another's trust or confidence; entrusted with secrets or private affairs: a confidential secretary. 4. (of information, a document, etc.)
a. bearing the classification confidential, usually being above restricted and below secret. b. limited to persons authorized to use information, documents, etc., so classified. Cf. classification (def. 5).