noncontradiction
noun
non·con·tra·dic·tion
ˌnän-ˌkän-trə-ˈdik-shən
: absence of logical contradiction
… the law of noncontradiction, which states that contradictory propositions cannot both be true at the same time and in the same sense.—Pat Zukeran
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Merriam-Webster unabridged
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