contraposition

[kon-truh-puh-zish-uhn] Origin

con·tra·po·si·tion

[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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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Contraposition has a plethora of syllables.
So is antidisestablishmentarianism. Does it mean:
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
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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