follow Dictionary.com

Why is the ninth month called September?

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
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
Cite This Source

Word of the Day

Difficulty index for contraposition

Few English speakers likely know this word

Word Value for contraposition

18
0
Scrabble Words With Friends