Definitions for "Contraposition"
A so-called immediate inference which consists in denying the original subject of the contradictory predicate; e. g.: Every S is P; therefore, no Not-P is S.
A form of eduction in which the subject of the inferred proposition is the contradictory of the predicate of the original proposition.
consists in contradicting both subject and predicate terms, then interchanging them; valid for and , but not for ; by limitation. ( Study 2)
Keywords:  opposite, position, placing, over
A placing over against; opposite position.