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From The Collaborative International Dictionary of English v.0.48:
Quiddity \Quid"di*ty\, n.; pl. Quiddities. [LL. quidditas, fr. L. quid what, neut. of quis who, akin to E. who: cf. F. quiddit['e].] 1. The essence, nature, or distinctive peculiarity, of a thing; that which answers the question, Quid est? or, What is it? " The degree of nullity and quiddity." --Bacon. [1913 Webster] The quiddity or characteristic difference of poetry as distinguished from prose. --De Quincey. [1913 Webster] 2. A trifling nicety; a cavil; a quibble. [1913 Webster] We laugh at the quiddities of those writers now. --Coleridge. [1913 Webster]