noun (n)

• the kinship relation between a male offspring and the siblings(noun.linkdef)

  source: wordnet30
• people engaged in a particular occupation(noun.group)

  Synonym:
  fraternity, sodality
  

  source: wordnet30
• the feeling that men should treat one another like brothers(noun.feeling)

  source: wordnet30
• an organization of employees formed to bargain with the employer(noun.group)

  Synonym:
  labor union, trade union, trades union, union
  

  source: wordnet30
• The state of being brothers or a brother.(noun)

  source: webster1913