contrapositive

[kon-truh-poz-i-tiv]Logic.
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noun
  1. a contrapositive statement of a proposition.

Origin of contrapositive

First recorded in 1855–60; contraposit(ion) + -ive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for contrapositive

antipode, antithesis, contrary, converse, counter, inverse, reverse

Examples from the Web for contrapositive

Historical Examples of contrapositive


British Dictionary definitions for contrapositive

contrapositive

adjective
  1. placed opposite or against
noun
  1. logic
    1. a conditional statement derived from another by negating and interchanging antecedent and consequent
    2. a categorial proposition obtained from another, esp validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for contrapositive
adj.

1858 (implied in contrapositively), from Latin contraposit-, past participle stem of contraponere (see contraposition) + -ive.

Online Etymology Dictionary, © 2010 Douglas Harper