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Definition of je ne sais quoi noun from the Oxford Advanced Learner's Dictionary

je ne sais quoi

noun
 
/ʒə nə seɪ ˈkwɑː/
 
/ʒə nə seɪ ˈkwɑː/
[uncountable] (from French, often humorous)
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  1. a good quality that is difficult to describe
    • He has that je ne sais quoi that distinguishes a professional from an amateur.
    Word OriginFrench, literally ‘I do not know what’.
See je ne sais quoi in the Oxford Advanced American Dictionary
trait
noun
 
 
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