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One who makes an affidavit.
[From affy, to make affidavit, from Middle English affien, to trust, from Old French affier, to promise; see affiance.]
(Law) law US a person who makes an affidavit
[C19: Old French, from affier to trust to, from Medieval Latin affīdāre; see affiance]
a person who makes an affidavit.