tribe in WordNet English dictionary

1. group of people related by blood or marriage
   kin  kin group  kinship group  kindred  clan  tribe 
   
2. a federation (as of American Indians)
   tribe  federation of tribes 
   
3. a social division of (usually preliterate) people
   tribe  folk 
   
4. (biology) a taxonomic category between a genus and a subfamily
   tribe