ARGUMENTUM AD IGNORATIAM by Law Professor Latin for an argument to the ignorance. An argument based upon ignorance (such as the ignorance of an adversary.) Related Posts:IGNORANCE OF THE LAWIGNORANTIA FACTI EXCUSAT IGNORANTIA JURIS NON EXCUSATARGUMENTUM AB AUCTORITATE FORTISSIMUM EST IN LEGEARGUMENTUM AD HOMINEMARGUMENTUM AB INCONVENIENTIIGNORANCE