An affidavit is a written statement that you swear is true and that may be used as evidence in a court of law. The disciplinary policy at Commerce allows only one punishment for "violation of 'no-strike' affidavit": removal.Affidavit definition: A written declaration made under oath before a notary public or other authorized officer. There is one meaning in OED's entry for the noun affidavit. 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. A declaration upon oath. Look up a court case or citation. Find a traffic ticket or court case using the county court's website.