of or relating to contraposition.


a contrapositive statement of a proposition.

Origin of contrapositive

First recorded in 1855–60; contraposit(ion) + -ive Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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



placed opposite or against


  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

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

Online Etymology Dictionary, © 2010 Douglas Harper