contraposition

[kon-truh-puh-zish-uh n]
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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 of contraposition

First recorded in 1545–55, contraposition is from the Late Latin word contrāposition- (stem of contrāpositiō). See contra1, position
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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Historical Examples of contraposition


British Dictionary definitions for contraposition

contraposition

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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