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Definition of brother
1a man or boy in relation to other sons and daughters of his parents. a male associate or fellow member of an organization:fraternity brothers (also brotha or brutha) informal a black man (chiefly used as a term of address among black people). a thing that resembles or is connected to another thing:the machine is almost identical to its larger brother
2 (plural also brethren /ˈbreT͟Hrin/) Christian Church a (male) fellow Christian. a member of a religious order or congregation of men:a Benedictine brother
used to express annoyance or surprise.