Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: brothor

brother

1 noun
     
Related topics: Christianity, College
broth‧er1 S1 W1 [countable]
1 a male who has the same parents as you [↪ sister]:
I have two brothers, William and Mark.
elder/older/younger etc brother
My younger brother is a doctor.
little/kid brother (=younger brother)
I have to take my little brother to school.
My big brother (=older brother) has always looked after me.
my twin brother
2 spoken informal a word meaning a black man, used especially by other black men
3 a male member of a group with the same interests, religion, profession etc as you
4RRC plural brothers or brethren a male member of a religious group, especially a monk:
Brother Justin
5 American EnglishSEC a member of a fraternity (=a club of male university students)
6

brothers in arms

literary soldiers who have fought together in a war
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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