'Contraposition' definitions:

Definition of 'Contraposition'

From: GCIDE
  • Contraposition \Con"tra*po*si"tion\, n. [Pref. contra- + position: cf. f. conterposition.]
  • 1. A placing over against; opposite position. [Obs.] --F. Potter. [1913 Webster]
  • 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. [1913 Webster]