Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fanatic”


noun [C]    /fəˈnæt̬·ɪk/
a person whose strong admiration for something is extreme and unreasonable: a fitness/exercise fanatic fanatical    /fəˈnæt̬·ɪ·kəl/ adjective Her devotion to her pets was fanatical.
(Definition of fanatic noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of fanatic

Definitions of “fanatic” in other dictionaries

Word of the Day


a situation in which two people are friends

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More