contraposition

contraposition

[kon-truh-puh-zish-uhn]
noun
1.
placement opposite or against.
2.
opposition, contrast, or antithesis.
3.
Logic. the inference drawn from a proposition by negating its terms and changing their order, as by inferring “Not B implies not A” from “A implies B.”

Origin:
1545–55; < Late Latin contrāposition- (stem of contrāpositiō). See contra1, position

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World English Dictionary
contraposition (ˌkɒntrəpəˈzɪʃən)
 
n
1.  the act of placing opposite or against, esp in contrast or antithesis
2.  logic the derivation of the contrapositive of a given categorial proposition

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Word Origin & History

contraposition
1550s, from L. contrapositionem, noun of action from contraponere, from contra "against" + ponere "to put, place" (see position).
Online Etymology Dictionary, © 2010 Douglas Harper
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