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contraposition

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contraposition

Main Entry:: con·tra·po·si·tion
Pronunciation:: \-pə-ˈzi-shən\
Function:: noun
Etymology:: Late Latin contraposition-, contrapositio, from Latin contraponere to place opposite, from contra- + ponere to place — more at position
Date:: 1551

: the relationship between two propositions when the subject and predicate of one are respectively the negation of the predicate and the negation of the subject of the other

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