The Collaborative International Dictionary
Affirmant
Affirmant \Af*firm"ant\ ([a^]f*f[~e]rm"ant), n. [L. affirmans, -antis, p. pr. See Affirm.]
One who affirms or asserts.
(Law) One who affirms, instead of taking an oath.
Wiktionary
affirmant
n. 1 One who affirms or asserts. 2 (context legal English) One who affirms of taking an oath.