Deponent

n.	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.
a.	1.	(Gram.) Having a passive form with an active meaning, as certain latin and Greek verbs.

Noun

1.

deponent - a person who testifies or gives a deposition Synonyms: testifier

DEPONENT, witness. One who gives information, on oath or affirmation, respecting some facts known to him, before a magistrate he who makes a deposition.

depone, depose, informant, swear, testifier, witness, witnesser