Affidavit: A written or printed statement made under oath. Amount in controversy: The amount of money at issue in a case.Affidavit definition: . See examples of AFFIDAVIT used in a sentence. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. An affidavit is a written statement which you swear is true and which may be used as evidence in a court of law. This affidavit is used to make complete disclosure of income, expenses and money owed. It is used to determine child and spousal support amounts. "First complete advertisement of the grant of letters.