sub·con·trar·y (s b-k n tr r  )n. pl. sub·con·tra·ries Logic A proposition related to another in such a way that both may be true, but both cannot be false. |
subcontrary [sʌbˈkɒntrərɪ] Logic
adj
(Philosophy / Logic) (of a pair of propositions) related such that they cannot both be false at once, although they may be true together Compare contrary [5] contradictory [3]
n pl -ries
(Philosophy / Logic) a statement that cannot be false when a given statement is false
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