con·fi·den·tial /ˌkän-fi-'den-chəl/ adj
1: known or conveyed only to a limited number of people
a confidential disclosure
2: marked by or indicative of intimacy, mutual trust, or willingness to confide esp. between parties one of whom is in a position of superiority
the confidential relationship of doctor and patient
3: containing information whose unauthorized disclosure could be prejudicial to the national interest
con·fi·den·ti·al·i·ty /ˌkän-fi-ˌden-chē-'a-lə-tē/ n
con·fi·den·tial·ly adv
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.