Con"tra*po*si"tion (?), n. [Pref. contra- + position: cf. f. conterposition.]
1.
A placing over against; opposite position.
[Obs.]
F. Potter.
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.
© Webster 1913.