'Tertium quid' definitions:

Definition of 'tertium quid'

(from WordNet)

noun

Some third thing similar to two opposites but distinct from both

Definition of 'Tertium quid'

From: GCIDE

Tertium quid \Ter"ti*um quid\ [L.] A third somewhat; something mediating, or regarded as being, between two diverse or incompatible substances, natures, or positions. [Webster 1913 Suppl.]

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