con·tra·pos·i·tive (k n tr -pz  -tv)n. Logic A proposition derived by negating and permuting the terms of another, equivalent proposition; for example, All not-Y is not-X is the contrapositive of All X is Y. |
contrapositive [ˌkɒntrəˈpɒzɪtɪv]
adj
(Philosophy / Logic) placed opposite or against
n
(Philosophy / Logic) Logic
a. a conditional statement derived from another by negating and interchanging antecedent and consequent
b. a categorial proposition obtained from another, esp validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular
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