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subcontrary

[ suhb-kon-trer-ee ]

noun

, Logic.
, plural sub·con·tra·ries.
  1. one of two propositions that can both be true but cannot both be false.


subcontrary

/ sʌbˈkɒntrərɪ /

adjective

  1. (of a pair of propositions) related such that they cannot both be false at once, although they may be true together Compare contrary contradictory
“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


noun

  1. a statement that cannot be false when a given statement is false
“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
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Word History and Origins

Origin of subcontrary1

1595–1605; < Medieval Latin subcontrārius, Late Latin ( sub-, contrary ), originally as translation of Greek hypenantíos

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