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Webster 1913 Edition

Contraposition

Con′tra-po-si′tion

,
Noun.
[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 1828 Edition

Contraposition

CONTRAPOSITION

,
Noun.
[contra and position.] A placing over against; opposite position.

Definition 2024

contraposition

contraposition

English

Noun

contraposition ‎(plural contrapositions)

  1. (logic) The statement of the form "if not Q then not P", given the statement "if P then Q".

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