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



    BrE BrE//fəˈnætɪk//
    ; NAmE NAmE//fəˈnætɪk//
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  1. 1(informal) a person who is extremely enthusiastic about something synonym enthusiast a fitness/crossword, etc. fanatic a self-confessed football fanatic
  2. 2(disapproving) a person who holds extreme or dangerous opinions synonym extremist religious fanatics See related entries: Terrorism
  3. Word Originmid 16th cent. (as an adjective): from French fanatique or Latin fanaticus ‘of a temple, inspired by a god’, from fanum ‘temple’. The adjective originally described behaviour or speech that might result from possession by a god or demon, hence the earliest sense of the noun ‘a religious maniac’ (mid 17th cent.).
See the Oxford Advanced American Dictionary entry: fanatic