Brother (UK band) definition

(1) A male with the same parents as someone else

"My brother still lives with our parents"

(2) (Roman Catholic Church) a title given to a monk and used as form of address

"A Benedictine Brother"

(3) A male person who is a fellow member (of a fraternity or religion of other group)

"None of his brothers would betray him"

(4) Used as a term of address for those male persons engaged in the same movement

"Greetings, comrade!"

(5) A close friend who accompanies his buddies in their activities