Meaning of “maniac” in the English Dictionary

"maniac" in American English

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maniacnoun [ C ]

us /ˈmeɪ·niˌæk/

maniac noun [ C ] (PERSON WITH STRONG INTEREST)

a person who has an unusually strong interest in an activity or subject:

My brother is a maniac when it comes to football.

maniac noun [ C ] (PERSON WITH MENTAL ILLNESS)

a person who seems unable to control his or her behavior and may commit violent acts:

a homicidal maniac

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