Source : Webster's Revised Unabridged Dictionary (1913)

Affiant \Af*fi"ant\, n. [From p. pr. of OF. afier, LL. affidare.
   See {Affidavit}.] (Law)
   One who makes an affidavit. [U. S.] --Burrill.

   Syn: Deponent. See {Deponent}.

Source : WordNet®

affiant
     n : a person who makes an affidavit