Affidavit: a sworn or affirmed statement made in writing and signed; if sworn, it is notarized. Affidavit definition: .See examples of AFFIDAVIT used in a sentence. You are required to make to the Court, under oath, a FULL DISCLOSURE of your income, net worth and financial condition on this form. An affidavit is a statement made under oath, claiming that a fact or set of facts is true to the best of the "affiant's" knowledge. Maintain the correct format for an affidavit. Affidavits are normally used in court proceedings or government agencies. J), two Appellant affidavits (Exh.