Affidavits are normally used in court proceedings or government agencies. An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters.An affidavit is a written statement. A person, known as the affiant, swears under oath to the statement's truthfulness. The Appellate Rules Committee of the North Carolina Bar Association (the. Affidavit definition: . See examples of AFFIDAVIT used in a sentence. AFFIDAVIT. North Carolina. Find definitions of legal terms to help understand the federal court system. Affidavit synonyms, affidavit pronunciation, affidavit translation, English dictionary definition of affidavit.