The term “a fortiori” is a Latin term that means “with a stronger reason,” “all the more reason,” “even more certainly.” E.g.: “If John was too drunk to operate a motor vehicle, a fortiori, he was too drunk to fly an airplane.” Related entries Pecus In Futuro Posse Comitatus Notitia Notio Lex Fori Donec Flagrante Delicto Retractus Feudalis Retractus Aquae