The Collaborative International Dictionary of English v.0.48:
Affirmance \Af*firm"ance\, n. [Cf. OF. afermance.] 1. Confirmation; ratification; confirmation of a voidable act. [1913 Webster] This statute . . . in affirmance of the common law. --Bacon. [1913 Webster] 2. A strong declaration; affirmation. --Cowper. [1913 Webster]