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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, esp. one who often acts as a companion
   - buddy [informal], chum [informal], crony [informal], pal [informal], cobber [Austral, informal], 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

See also: sidekick [informal]

Type of: china [Brit, informal], fellow member, friend, male sibling, mate [Brit, informal], member, monastic, monk

Antonym: sister

Part of: brotherhood, fraternity, sodality

Encyclopedia: Brother, Cry for Me