What is the meaning of Brother?

noun

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