Noun
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(Roman Catholic Church) a title given to a monk and used as form of address
"a Benedictine Brother"
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used as a term of address for those male persons engaged in the same movement
"Greetings, comrade!"
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a close friend who accompanies his buddies in their activities
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a male person who is a fellow member (of a fraternity or religion or other group)
"none of his brothers would betray him"
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a male with the same parents as someone else
"my brother still lives with our parents"
- blood brother