1Confirmation, corroboration; an instance of this. Frequently in "in affirmance" (of something).
Ratification or confirmation of a law, etc.; the upholding of a legal decision; specifically an appellate court's confirmation of the judgment or order of a lower court. Chiefly with of.
Late Middle English (in an earlier sense). From Anglo-Norman affermaunce, affirmaunce, Anglo-Norman and Middle French affermance, affirmance action or act of affirming, assertion, confirmation, corroboration, (of a law, verdict, etc.) ratification, confirmation from affermer, affirmer + -ance.