Source : Webster's Revised Unabridged Dictionary (1913)

Confession \Con*fes"sion\, n. [F. confession, L. confessio.]
   1. Acknowledgment; avowal, especially in a matter pertaining
      to one's self; the admission of a debt, obligation, or
      crime.

            With a crafty madness keeps aloof, When we would
            bring him on to some confession Of his true state.
                                                  --Shak.

   2. Acknowledgment of belief; profession of one's faith.

            With the mouth confession is made unto salvation.
                                                  --Rom. x. 10.

   3. (Eccl.) The act of disclosing sins or faults to a priest
      in order to obtain sacramental absolution.

            Auricular confession . . . or the private and
            special confession of sins to a priest for the
            purpose of obtaining his absolution.  --Hallam.

   4. A formulary in which the articles of faith are comprised;
      a creed to be assented to or signed, as a preliminary to
      admission to membership of a church; a confession of
      faith.

   5. (Law) An admission by a party to whom an act is imputed,
      in relation to such act. A judicial confession settles the
      issue to which it applies; an extrajudical confession may
      be explained or rebutted. --Wharton.

   {Confession and avoidance} (Law), a mode of pleading in which
      the party confesses the facts as stated by his adversary,
      but alleges some new matter by way of avoiding the legal
      effect claimed for them. --Mozley & W.

   {Confession of faith}, a formulary containing the articles of
      faith; a creed.

   {General confession}, the confession of sins made by a number
      of persons in common, as in public prayer.

   {Westminster Confession}. See {Westminster Assembly}, under
      {Assembly}.

Source : WordNet®

confession
     n 1: an admission of misdeeds or faults
     2: a written document acknowledging an offense and signed by
        the guilty party
     3: (Roman Catholic Church) the act of a penitent disclosing his
        sinfulness before a priest in the sacrament of penance in
        the hope of absolution
     4: a public declaration of your faith
     5: a document that spells out the belief system of a given
        church (especially the Reformation churches of the 16th
        century)