af·firm (ə-fûrm') v.
af·firmed, af·firm·ing, af·firms
v.
tr.
To declare positively or firmly; maintain to be true.
To support or uphold the validity of; confirm.
v.
intr.Law To declare solemnly and formally but not under oath.
[Middle English affermen, from Old French afermer, from Latin affirmāre : ad-, ad- + firmāre, to strengthen (from firmus, strong; see dher- in Indo-European roots).] af·firm'a·ble adj., af·firm'a·bly adv., af·fir'mant adj. & n., af·firm'er n.