A FORTIORI

a  fortiori  (ay  for-shee-or-Ior  ah  for-shee-or-ee),  adv.[Latin]  By  even  greater  force  of  logic;

even more so <if a 14-year-old child cannot sign a binding contract, then, a fortiori, a 13-year-old

cannot>. Cf. A MULTO FOR-TIORI . [Blacks Law 8th]