brotherhood

Short definition from Wiktionary

Noun

1. 1
   The state of being brothers or a brother (also figuratively).
2. 2
   An association of people for any purpose, such as a society of monks; a fraternity.
3. 3
   All the people engaged in the same business, especially those of the same profession
4. 4
   People, or (poetically) things, of the same kind.