An example of a brother is a boy who has a sister.
An example of a brother is a fellow member of a trade union.
- A kinsman.
- A fellow man.
- A fellow member, as of a fraternity, trade union, or panel of judges on a court.
- A close male friend; a comrade.
- A fellow African-American man or boy.
Origin of brother
- Middle English from Old English brōthor bhrāter- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition