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1. A male with the same parents as someone else
   "my brother still lives with our parents";
   - blood brother
    
2. (religion) a male person who is a fellow member (of a fraternity, religion or other group)
   "none of his brothers would betray him"
    
3. A close friend who accompanies his buddies in their activities
   - buddy, chum, crony, pal, sidekick, bud [N. Amer, informal], compadre, paisano [US]
    
4. Used as a term of address for those male persons engaged in the same movement
   "Greetings, brother!";
   - comrade

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

Derived forms: Brothers, brothers

Type of: fellow member, friend, male sibling, member, monastic, monk

Antonym: sister

Part of: brotherhood, fraternity, sodality

Encyclopedia: Brother, Cry for Me