/ Dictionary / Index Q quiddity: Meaning and Definition of Find definitions for: quid•di•ty Pronunciation: (kwid'i-tē), [key] — pl. -ties. the quality that makes a thing what it is; the essential nature of a thing. a trifling nicety of subtle distinction, as in argument. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quiddity (Thesaurus) Quidde quidnunc Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language