Definition of “hero” - English Dictionary

“hero” in British English

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heronoun [ C ]

uk /ˈhɪə.rəʊ/ us /ˈhɪr.oʊ/ plural heroes

hero noun [ C ] (PERSON)

B1 a person who is admired for having done something very brave or having achieved something great:

a war hero
He became a national hero for his part in the revolution.
humorous Graham says he'll take my parents to the airport at four o'clock in the morning - what a hero!
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See also

B1 female heroine the main male character in a book or film who is usually good:

the hero of her latest novel
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someone who you admire very much:

Humphrey Bogart's my hero - I've seen every one of his movies.
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More examples

hero noun [ C ] (FOOD)

US a long sandwich filled with cold meat, cheese, salad, etc.

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

“hero” in American English

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heronoun [ C ]

us /ˈhɪər·oʊ/ plural heroes female heroine, /ˈher·oʊ·ɪn/

literature The hero is the main character of a story, play, or movie.

heroic
adjective [ not gradable ] us /hɪˈroʊ·ɪk/

The ceremony at City Hall honored the heroic acts of firefighters who lost their lives.

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