1 A statement made in connection with a case or legal matter, or intended to have a formal status or effect. 2 A written document, synonymous in some jurisdictions with affidavit and in others (although antiquated) with complaint. 3 A written document governing rights and obligations among property owners, as in declaration of condominium or declaration of covenants and restrictions. declaration against interest. A statementthat is assumed to be truthful because it is contrary to the declaran...