What does "confidential" mean?

Confidential: Communicated in confidence; secret. "Confidential messages." Burke. Confidential communication (Law) See Privileged communication, under Privileged. -- Confidential creditors, those whose claims are of such a character that they are entitled to be paid before other creditors. -- Confidential debts, debts incurred for borrowed money, and regarded as having a claim to be paid before other debts. McElrath.