brotherhoodn.[Brother + -hood.]1. The state of being brothers or a brother.()2. An association for any purpose, as a society of monks; a fraternity.()3. The whole body of persons engaged in the same business, -- especially those of the same profession; as, the legal or medical brotherhood.()4. Persons, and, poetically, things, of a like kind.()A brotherhood of venerable trees. (Wordsworth.)()