contrapositive

noun
con·tra·pos·i·tive | \ ˌkän-trə-ˈpä-zə-tiv , -ˈpäz-tiv \

Definition of contrapositive 

: a proposition or theorem formed by contradicting both the subject and predicate or both the hypothesis and conclusion of a given proposition or theorem and interchanging them "if not-B then not-A " is the contrapositive of "if A then B "

First Known Use of contrapositive

1870, in the meaning defined above

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The first known use of contrapositive was in 1870

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