Definition of fanatic noun from the Oxford Advanced American Dictionary

     

    fanatic

     noun
    noun
    NAmE//fəˈnæt̮ɪk//
     
     
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  1. 1(informal) a person who is extremely enthusiastic about something synonym enthusiast a fitness/crossword, etc. fanatic
  2. 2(disapproving) a person who holds extreme or dangerous opinions synonym extremist religious fanatics
NAmE//fəˈnæt̮ɪkl//
 
adjective a fanatical supporter the fanatical anti-communists a fanatical interest in baseball She's fanatical about healthy eating.
fanatically
 
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NAmE//fəˈnæt̮ɪkli//
 
adverb fanatically organized
See the Oxford Advanced Learner's Dictionary entry: fanatic