1. To declare positively or firmly; maintain to be true. 2. To support or uphold the validity of; confirm.
INTRANSITIVE VERB:
Law To declare solemnly and formally but not under oath.
ETYMOLOGY:
Middle English affermen, from Old French afermer, from Latin affirmre : ad-, ad- + firmre, to strengthen (from firmus, strong; see dher- in Appendix I).