1. (

• confidential

) entrusted with private information and the confidence of another; "a confidential secretary" ;

2. (

• confidential ,
• secret

) (of information) given in confidence or in secret; "this arrangement must be kept confidential"; "their secret communications" ;

3. (

• confidential

) denoting confidence or intimacy; "a confidential approach"; "in confidential tone of voice" ;

4. (

• confidential

) the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified ;