Definitions

1. noun

A male who has the same parents as another person or a male who is closely associated with another person, such as a friend or a colleague.

“He’s my older brother who always looks out for me.”

2. noun

A member of a fraternity or brotherhood, especially a secret society.

“The fraternity brother was known for his charity work in the community.”

3. verb

To make (one person or thing) the brother of another, especially in a formal or official sense.

“The judge brothered the two children after their parents’ divorce.”