contraposition

American  

[kon-truh-puh-zish-uhn] / 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.”

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contraposition British  

/ 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

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Etymology

Origin of contraposition

First recorded in 1545–55, contraposition is from the Late Latin word contrāposition- (stem of contrāpositiō ). See contra ¹, position

Example Sentences

While perhaps a direct contraposition to point number one, it's worth remembering that Doc/Fest is a cross-platform, multimedia festival, as well as being a haven for the factually obsessed.

From The Guardian • May 9, 2013

Paolo Rodari, who writes about the Vatican for the newspaper Il Foglio, said the episode depicted “a widening contraposition happening in the Vatican between Bertone and different clerics who do not like his politics.”

From New York Times • Jan. 27, 2012

Logicians seem to have overlooked the fact that conversion by contraposition is as applicable to the O as to the A proposition, though, when expressed in symbols, it presents a more clumsy appearance.

From Deductive Logic by Stock, St. George William Joseph

This statement contemplates conversion by contraposition only in reference to the A proposition, to which the process has hitherto been confined.

From Deductive Logic by Stock, St. George William Joseph

This is equivalent, as the converse by contraposition, with— All capable of passing have worked at the subject.

From Logic, Inductive and Deductive by Minto, William