Brother

1. Son of the same parents as another person.
2. A male having at least one parent in common with another (see half-brother, stepbrother).
3. A male fellow member of a religious community, church, trades union etc.

   I would like to thank the brother who just spoke.

4. A form of address to a man.

   Listen, brother, I don't know what you want, but I'm not interested.

5. A black male.
6. Somebody, usually male, connected by a common cause or situation.
7. Someone who is a peer, whether male or female.

verb

To treat as a brother.

1. Expressing exasperation.

   We're being forced to work overtime? Oh, brother!