Definition of quiddity noun from the Oxford Advanced Learner's Dictionary

 

quiddity

 noun
noun
BrE BrE//ˈkwɪdɪti//
 
; NAmE NAmE//ˈkwɪdɪti//
 
[uncountable](philosophy)
 
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the real nature of something Word Origin late Middle English: from medieval Latin quidditas, from Latin quid ‘what’.
See the Oxford Advanced American Dictionary entry: quiddity