Definition of idiosyncrasy noun from the Oxford Advanced American Dictionary

     

    idiosyncrasy

     noun
    noun
    NAmE//ˌɪdiəˈsɪŋkrəsi//
     
    (pl. idiosyncrasies)[countable, uncountable]
     
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  1. 1a person's particular way of behaving, thinking, etc., especially when it is unusual; an unusual feature synonym eccentricity
  2. 2 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 the Oxford Advanced Learner's Dictionary entry: idiosyncrasy