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Definition of tertium quid


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ter·ti·um quid  audio  (tûrsh-m kwd, trt-m) KEY 

NOUN:
  1. Something that cannot be classified into either of two groups considered exhaustive; an intermediate thing or factor.
  2. A third person or thing of indeterminate character.

ETYMOLOGY:
Late Latin : Latin tertium, from neuter of tertius, third + quid, something


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