contraries (root: contrary)

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CIDE DICTIONARY

contraries, n. pl. [Pl. of Contrary, n.].

Propositions which directly and destructively contradict each other, but of which the falsehood of one does not establish the truth of the other. [1913 Webster]

"If two universals differ in quality, they are contraries; as, every vine is a tree; no vine is a tree. These can never be both true together; but they may be both false." [1913 Webster]