brother

noun

1. 1

   a male with the same parents as someone else

   my brother still lives with our parents

   a Benedictine Brother

2. 2

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

   my brother still lives with our parents

   a Benedictine Brother

3. 3

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

   none of his brothers would betray him

4. 4

   used as a term of address for those male persons engaged in the same movement

   Greetings, comrade!

5. 5

   a close friend who accompanies his buddies in their activities