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Definition of idiosyncrasy noun from the Oxford Advanced American Dictionary

 

idiosyncrasy

 noun
noun
NAmE//ˌɪdiəˈsɪŋkrəsi//
 
(pl. idiosyncrasies) [countable, uncountable]
 
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a person's particular way of behaving, thinking, etc., especially when it is unusual; an unusual feature synonym eccentricity Wearing a raincoat, even on a hot day, is one of her idiosyncrasies. The car has its little idiosyncrasies.
idiosyncratic
 
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NAmE//ˌɪdioʊsɪŋˈkræt̮ɪk//
 
adjective His teaching methods are idiosyncratic but successful.
See idiosyncrasy in the Oxford Advanced Learner's Dictionary