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subcontrary

[suhb-kon-trer-ee] /sʌbˈkɒn trɛr i/
noun, plural subcontraries. Logic.
1.
one of two propositions that can both be true but cannot both be false.
Origin
1595-1605
1595-1605; < Medieval Latin subcontrārius, Late Latin (see sub-, contrary), orig. as translation of Greek hypenantíos
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for subcontrary

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 (sense 5), contradictory (sense 3)
noun (pl) -ries
2.
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
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