Definitions for brother

(a male with the same parents as someone else; "my brother still lives with our parents")

(a male person who is a fellow member (of a fraternity or religion or other group); "none of his brothers would betray him")

(a close friend who accompanies his buddies in their activities)

(used as a term of address for those male persons engaged in the same movement; "Greetings, comrade!")

((Roman Catholic Church) a title given to a monk and used as form of address; "a Benedictine Brother")