sub contrary

subcontrary

[suhb-kon-trer-ee]
noun, plural subcontraries. Logic.
one of two propositions that can both be true but cannot both be false.

Origin:
1595–1605; < Medieval Latin subcontrārius, Late Latin (see sub-, contrary), orig. as translation of Greek hypenantíos

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World English Dictionary
subcontrary (sʌbˈkɒntrərɪ)
 
adj
1.  contrary Compare contradictory (of a pair of propositions) related such that they cannot both be false at once, although they may be true together
 
n , -ries
2.  a statement that cannot be false when a given statement is false

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