Meaning of quiddity

quid•di•ty

Pronunciation: (kwid'i-tē), [key]
— pl. -ties.
  1. the quality that makes a thing what it is; the essential nature of a thing.
  2. a trifling nicety of subtle distinction, as in argument.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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