The Collaborative International Dictionary
Compaternity
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.
Wiktionary
compaternity
n. (context obsolete English) The relationship of a godfather to a person.