1. Law One who deposes or testifies under oath; one who gives evidence; usually, one who testifies in writing.
2. Gr. & Lat. Gram. A deponent verb.
Syn: -- Deponent, Affiant.
Usage: These are legal terms describing a person who makes a written declaration under oath, with a view to establish certain facts. An affiant is one who makes an affidavit, or declaration under oath, in order to establish the truth of what he says. A deponenet is one who makes a deposition, or gives written testimony under oath, to be used in the trial of some case before a court of justice. See under Deposition.
De·po·nent, a. Gram. Having a passive form with an active meaning, as certain latin and Greek verbs.
n : a person who testifies or gives a deposition [syn: testifier]