NOUN (2)

1. a priest who hears confession and gives absolution;

2. someone who confesses (discloses information damaging to themselves);

The Collaborative International Dictionary of English v.0.48:

Confessor \Con*fess"or\ (?; 277), n. [OF. confessor, F.
   confesseur, fr. L. & LL. confessor.]
   1. One who confesses; one who acknowledges a fault, or the
      truth of a charge, at the risk of suffering; specifically,
      one who confesses himself a follower of Christ and endures
      persecution for his faith.
      [1913 Webster]

            He who dies for religion is a martyr; he who suffers
            for it is a confessor.                --Latham.
      [1913 Webster]

            Our religion which hath been sealed with the blood
            of so many martyrs and confessors.    --Bacon.
      [1913 Webster]

   2. A priest who hears the confessions of others and is
      authorized to grant them absolution.
      [1913 Webster]