Definition of fanaticism noun from the Oxford Advanced American Dictionary

     

    fanaticism

     noun
    noun
    NAmE//fəˈnæt̮əˌsɪzəm//
     
    [uncountable](disapproving)
     
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  1. 1extreme beliefs or behavior, especially in connection with religion or politics synonym extremism
  2. 2 driven by religious fanaticism the fanaticism of some sports fans
See the Oxford Advanced Learner's Dictionary entry: fanaticism