Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Contrapositive" Definition
noun
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.
Source: American Heritage Dictionary
A proposition or theorem formed by both the subject and predicate or both the hypothesis and conclusion of a given proposition or theorem and interchanging them .
Source: Merriam-Webster
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