Definition of fanaticism noun from the Oxford Advanced Learner's Dictionary

 

fanaticism

 noun
noun
BrE BrE//fəˈnætɪsɪzəm//
 
; NAmE NAmE//fəˈnætɪsɪzəm//
 
[uncountable](disapproving)
 
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extreme beliefs or behaviour, especially in connection with religion or politics synonym extremism driven by religious fanaticism the fanaticism of football supporters
See the Oxford Advanced American Dictionary entry: fanaticism