What does "tribe" mean?

Additional senses

1. 2.(Bot.) A number of species or genera having certain structural characteristics in common; as, a tribe of plants; a tribe of animals. Note: By many recent naturalists, tribe has been used for a group of animals or plants intermediate between order and genus.family is between order and genus.
2. 3.A nation of savages or uncivilized people; a body of rude people united under one leader or government; as, the tribes of the Six Nations; the Seneca tribe.
3. 4.A division, class, or distinct portion of a people, from whatever cause that distinction may have originated; as, the city of Athens was divided into ten tribes.
4. 5.(Stock Breeding) A family of animals descended from some particular female progenitor, through the female line; as, the Duchess tribe of shorthorns.
5. 6.To distribute into tribes or classes. [R.] Our fowl, fish, and quadruped are well tribed. Abp. Nicolson.