brotherhood in WordNet English dictionary

1. the feeling that men should treat one another like brothers
   brotherhood 
   
2. people engaged in a particular occupation
   "the medical fraternity"
   brotherhood  fraternity  sodality 
   
3. an organization of employees formed to bargain with the employer
   "you have to join the union in order to get a job"
   union  labor union  trade union  trades union  brotherhood 
   
4. the kinship relation between a male offspring and the siblings
   brotherhood