1. (

• brother ,
• blood_brother

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

2. (

• brother ,

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

3. (

• buddy ,
• brother ,
• chum ,
• crony ,
• pal ,
• sidekick

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

4. (

• brother ,
• comrade ,

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

5. (

• Brother ,

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