Illicit MajorAlias: Illicit Process of the Major Term
Type: Illicit Process
This diagram represents both the Example and Counter-Example. It does not show the conclusion, "No S is P", to be true, because the area with the question mark is not shown to be empty.
An "illicit process of the major" is not an illegal trial of a military officer, rather it is a syllogistic fallacy in which the major term is undistributed in the major premiss, but distributed in the conclusion, which is the "illicit process"that is, "illicit" distribution, in the sense of breaking the rules of the categorical syllogism.
Sibling Fallacy: Illicit Minor
Irving Copi & Carl Cohen, Introduction to Logic (Tenth Edition) (Prentice Hall, 1998), pp. 276-7.