brother Meaning in the Cambridge English Dictionary
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Meaning of “brother” in the English Dictionary

"brother" in British English

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brothernoun [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 ​unjustlaw!" 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 ​religiousorganization: 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"brother" in American English

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brothernoun [C]

 us   /ˈbrʌð·ər/
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, ​religiousgroup, or ​organization: a ​fraternity brother Brother may be used by a man to ​address another man: Hey, brother, can you ​spare a ​quarter?

brotherexclamation

 us   /ˈbrʌð·ər, ˈbrʌˈðɜr/
used to ​expressannoyance or ​surprise: Oh, brother, are we in a ​mess now!
(Definition of brother from the Cambridge Academic Content Dictionary © Cambridge University Press)
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