An affidavit is a written statement which you swear is true and which may be used as evidence in a court of law. An affidavit is a type of verified statement or showing, or containing a verification, meaning it is made under oath on penalty of perjury.Affidavit definition: . See examples of AFFIDAVIT used in a sentence. An affidavit is a formal written document in which the signer swears under oath that the statements in the document are true. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. A supplemental affidavit is a written statement of facts that someone swears to be true in front of a person who can administer oaths, like a notary public. WakeDOM02 Affidavit For Judicial Assignment And Notice Of Hearing (fillable). After completing the Financial Affidavit, you must have it notarized.