noun

• (informal) A form of address to a man.
  "Brother, can you spare a dime?"
• (African-American Vernacular) A fellow black man.
  "[Michael Jackson] went on television and said, “I don't have sex because of my religious beliefs”, and the public believed it. I know brothers was like “get the fuck out of here!”. And white people, “Michael's a special kinda guy!”"
• (poetic) Someone who is a kinsman or shares the same patriarch.
  "The eighteenth century text, with its antislavery message and its Adamic figuration, calls implicily for the reconciliation of all peoples as "brothers" (not the reprehensible brothers of Joseph but the cocreated brothers of Adam)."

verb

• (transitive) To treat as a brother.
  "Seest thou not we are overreached, and that our proposed mode of communicating with our friends without has been disconcerted by this same motley gentleman thou art so fond to brother?"