Definition of incidence noun from the Oxford Advanced American Dictionary

      

    incidence

     noun
    noun
    NAmE//ˈɪnsədəns//
     
     
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  1. 1[countable, usually singular] incidence of something (formal) the extent to which something happens or has an effect an area with a high incidence of crime
  2. 2[uncountable] (physics) the way in which light meets a surface the angle of incidence
See the Oxford Advanced Learner's Dictionary entry: incidence