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English definition of “brother”

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brother

noun [C] uk   /ˈbrʌð.ər/ us    //
A1 a man or boy with the same parents as another person: Do you have any brothers and sisters? I have three brothers and a sister. Johnny is my younger/older/big/baby/little brother. My brother lives in Washington. a man who is a member of the same group as you or who shares an interest with you or has a similar way of thinking to you: [as form of address] "Let us unite, brothers and fight this unjust law!" US informal sometimes used by a black man to address or refer to another black man used as the title of a man, such as a monk, who belongs to a religious organization: Brother Michael and Brother John were deep in conversation. [as form of address] Bless you, Brother.
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(Definition of brother from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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