Source : Webster's Revised Unabridged Dictionary (1913)

Compaternity \Com`pa*ter"ni*ty\, n. [LL. compaternitas, fr.
   compater godfather; com- + pater father.]
   The relation of a godfather to a person. [Obs.]

         The relation of gossipred or compaternity by the canon
         law is a spiritual affinity.             --Sir J.
                                                  Davies.