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tertium quid

[tur-shee-uh m kwid; Latin ter-ti-oo m kwid] /ˈtɜr ʃi əm ˈkwɪd; Latin ˈtɛr tɪˌʊm ˈkwɪd/
something related in some way to two things, but distinct from both; something intermediate between two things.
Origin of tertium quid
1715-25; < Latin, translation of Greek tríton·ti some third thing Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for tertium quid

tertium quid

/ˈtɜːtɪəm ˈkwɪd/
an unknown or indefinite thing related in some way to two known or definite things, but distinct from both: there is either right or wrong, with no tertium quid
Word Origin
C18: from Late Latin, rendering Greek triton ti some third thing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tertium quid

1724, Latin, literally "third something," loan-translation of Greek triton ti (Plato), used in alchemy for "unidentified element present in a combination of two known ones."

Online Etymology Dictionary, © 2010 Douglas Harper
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