hero Definition in the Cambridge English Dictionary
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Definition of “hero” - English Dictionary

Definition of "hero" - American English Dictionary

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heronoun [C]

 us   /ˈhɪər·oʊ/ (plural heroes) (female heroine,  /ˈher·oʊ·ɪn/ )
a ​personadmired for ​bravery, ​greatachievements, or good ​qualities literature The hero is the ​maincharacter of a ​story, ​play, or ​movie.
adjective [not gradable]  us   /hɪˈroʊ·ɪk/
The ​ceremony at City Hall ​honored the heroic ​acts of ​firefighters who ​losttheirlives.
(Definition of hero from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "hero" - British English Dictionary

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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!
See also
B1 (female heroine) the ​mainmalecharacter in a ​book or ​film who is usually good: the hero of her ​latestnovel
someone who you ​admire very much: Humphrey Bogart's my hero - I've ​seen every one of his ​movies.
More examples

hero noun [C] (FOOD)

US a ​longsandwichfilled with ​coldmeat, ​cheese, ​salad, etc.
(Definition of hero from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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