contrapositive Hear it!

contrapositive definition

contra·posi·tive (-päz′ə tiv′)

noun

Logic a proposition obtained by negating and transposing the terms of a given proposition the contrapositive of “All A is B” is “All not-B is not-A”

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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