Meaning of “fanatic” in the English Dictionary

(Definition of “fanatic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fanatic" in American English

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fanaticnoun [ C ]

us /fəˈnæt̬·ɪk/

a person whose strong admiration for something is extreme and unreasonable:

a fitness/exercise fanatic
adjective us /fəˈnæt̬·ɪ·kəl/

Her devotion to her pets was fanatical.

(Definition of “fanatic” from the Cambridge Academic Content Dictionary © Cambridge University Press)