Source : Webster's Revised Unabridged Dictionary (1913)

Confidential \Con`fi*den"tial\, a. [Cf. F. confidentiel.]
   1. Enjoying, or treated with, confidence; trusted in;
      trustworthy; as, a confidential servant or clerk.

   2. 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.