Also called what·ness [hwuht-nis, wuht‐] /ˈʰwʌtˌnɪs, ˈwʌt‐/ . the quality that makes a thing what it is; the essential nature of a thing.
a trifling nicety of subtle distinction, as in argument.
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How to use quiddity in a sentence
Next came the redoubtable Mr. Mumbles himself, leading Mrs. Mumbles by the hand, preceded by the young lawyer quiddity.
On the next interview Mr. Mumbles, delighted with the report of quiddity, addressed him with truly dignified solemnity.
The lawyer's clerk, whose name was quiddity, also set about publishing the whole of the matter abroad.
Whatness and affections (quiddity) of being distinguishes between, ii.Plotinos: Complete Works, v. 4 | Plotinos (Plotinus)
Nature herself is maya; natural science must perforce deal with her ineluctable quiddity.Autobiography of a YOGI | Paramhansa Yogananda
British Dictionary definitions for quiddity
philosophy the essential nature of something: Compare haecceity
a petty or trifling distinction; quibble
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