Lat. In the civil Uw. A quasi contract, by which he who receives a certain sum of money, or a certain quan-tity of fungible things, which have been paid to him through mistake, contracts towards the payer the obligation of returning him as much. Poth, de l’Usure, pt 3, s. 1, a. 1
Source: Black's Law Dictionary 2nd Ed (1910)
