[F., f. phr. à val at the bottom:—L. ad vallem: see AVALE v.] An endorsement (lit. a writing ‘at the bottom’) on a commercial document, guaranteeing payment of it.
1880. Ld. Blackburn, in Law Rep., Appeal, V. 772. An indorsement … by what was called an aval … either on the bill itself or a separate paper.
