An affidavit is a written statement that you swear is true and that may be used as evidence in a court of law. An affidavit is a written statement which you swear is true and which may be used as evidence in a court of law.A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. Affidavit definition: . In a different context, federal courts have upheld USCIS' ability to interpret significance from whether the singular or plural is used in a regulation. Modern legislation uses ordinary. English words, which acquire additional meanings from this very spe- cial context. We hope that you find this Handbook helpful, and that it provides some aid in protecting your rights behind bars. This contradictory legislation demonstrates, at a minimum, that any liberty interest in a spouse's visa application has shallow roots. And.