contraposition

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con·tra·po·si·tion

 (kŏn′trə-pə-zĭsh′ən)
n.
An opposite position; antithesis.

contraposition

(ˌkɒntrəpəˈzɪʃən)
n
1. the act of placing opposite or against, esp in contrast or antithesis
2. (Logic) logic the derivation of the contrapositive of a given categorial proposition

con•tra•po•si•tion

(ˌkɒn trə pəˈzɪʃ ən)

n.
1. placement opposite or against.
2. opposition or antithesis.
3. 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.”
[1545–55; < Late Latin]
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contraposition

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References in periodicals archive ?
The most they can usually achieve is to convince people who love logic but hate contrapositives.
5) The contrapositive of "If A, then B" is "If not-B, then not-A.