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contraposition

[kon-truh-puh-zish-uh n] /ˌkɒn trə pəˈzɪʃ ən/
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
1545-1555
1545-55; < Late Latin contrāposition- (stem of contrāpositiō). See contra1, position
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for contraposition

contraposition

/ˌkɒntrəpəˈzɪʃən/
noun
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for contraposition
n.

1550s, from Late Latin contrapositionem (nominative contrapositio), noun of action from past participle stem of contraponere, from contra "against" (see contra) + ponere "to put, place" (see position (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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