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English definition of “brother”

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brother

noun [C]  /ˈbrʌð·ər/ us  
a male who has the same parents as another person: an older/younger brother A brother is also a member of the same race, church, religious group, or organization: a fraternity brother Brother may be used by a man to address another man: Hey, brother, can you spare a quarter?
(Definition of brother noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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