Noun
A placing over against; opposite position.
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.
Source: Webster's dictionaryRelated terms Contraposition and transposition Contraposition is a logically valid rule of inference that allows the creation of a new proposition from the negation and reordering of an existing one. Source: Internet
Transposition is exactly the same thing as Contraposition, described in a different language. Source: Internet