CONTRAPOSITION

contraposition. Contraposition, n. the act of placing against

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Con″tra‐po‐si″tion (?), n. [[Pref. contra- + position: cf. f. conterposition.]] 1. 1. A placing over against; opposite position. F. Potter.
2. 2. (Logic) 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.