contrapositive

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

Definition of contrapositive

  1. :  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 ”

1870

First Known Use of contrapositive

1870

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the point at which something begins

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