Affiant Legal Definition: A person that is sworn to an affidavit; who gives evidence by way of an affidavit. Related Terms: Affidavit , Deponent , Deposition , Jurat Synonymous with deponent in jurisdictions that prefer the word deposition to affidavit. Both affiant and deponent refer to the author and signatory of a sworn statement given under oath and containing allegations of fact intended to serve as evidence in judicial proceedings, except that the process of a deposition differs from the process of an affidavit. Two persons sign an affidavit, the person setting out the allegations of fact and swearing them to be true, on solemn oath or on a religious oath, and the person administering the oath, the oath officer (usually a lawyer, a notary or a commissioner of oath). Categories & Topics: Duhaime's Civil Litigation & Evidence Law Dictionary Unless otherwise noted, this page was written by Lloyd Duhaime of Duhaime.org Always looking up definitions? Save time with our search provider (modern browsers only) If you find an error or omission in Duhaime's Law Dictionary, or if you have suggestion for a legal term, we'd love to hear from you!