Deponent

An individual who, under oath or affirmation, gives out-of-court testimony in a deposition. A deponent is someone who gives evidence or acts as a witness. The testimony of a deponent is written and carries the deponent's signature.

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deponent n. a person testifying (stating answers in response to questions) at a deposition. (See: depose, deposition)

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