Tertium-quid meaning

tûrshē-əm kwĭd, tĕrtē-o͝om
Something that cannot be classified into either of two groups considered exhaustive; an intermediate thing or factor.
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A third person or thing of indeterminate character.
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Something of uncertain or unclassifiable nature, related to, but distinct from, two, usually opposite, things.
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Something intermediate between two classifications.
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Origin of tertium-quid

  • Late Latin Latin tertium from neuter of tertius third quid something

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin tertium from tertius, third + quid, thing

    From Wiktionary