Quiddity n. : The essence, nature, or distinctive peculiarity, of a thing; that which answers the question, Quid est? or, What is it?

Quiddity n. : A trifling nicety; a cavil; a quibble.

Example:
How is the word "Quiddity" used?

Taxonomy
Quiddity, free encyclopedia, quidditas, whatness, Latin word, substance, search, free dictionary, literal translation, equivalent term, Aristotle's, Greek, general description, by way of, commonality, thisness, positive characteristic, senses.

Defination from the web:
quiddity (Latin quidditas) was another term for the essence of an object, literally its "whatness," or "what it is. ... Quiddity is the name for the mystical dream sea in Clive Barker's novel The Great and Secret Show that exists as a higher plane of human existence. ...