Casus Foederis Law and Legal Definition

Casus foederis is a Latin term meaning, “the case of the treaty” or the case of the agreement. Under international law, it is a provocative act by one nation toward another. It is also a clause within a treaty of alliance specifying such provocative acts. Under contracts, casus foederis is a case or an event falling within the terms of a contract.[ Foote v. Brown, 9 F. Cas. 360 (C.C.D. Ind. 1841).