subcontrary

[suhb-kon-trer-ee]

sub·con·tra·ry

[suhb-kon-trer-ee]
noun, plural sub·con·tra·ries. 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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Subcontrary is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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