Actio condictio indebiti
ACTIO CONDICTIO INDEBITI. The name of an action in the civil law, by which the plaintiff recovers the amount of a sum of money or other thing be paid by mistake. Poth. Promutuum, n. 140. See Assumpsit.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.