A person who testifies on affirmation, or who affirms instead of taking an oath. See Affiem’ation. Used in affidavits and depositions which are affirmed, instead of sworn to in place of the word “deponent.” Affirmantis est probare. He who affirms must prove. Porter v. Stevens, 9 Cush. (Mass.) 535. Affirmanti, non neganti incnmbit pro batio. The [burden of] proof lies upon him who affirms, not upon one who denies. Steph. PL 84.