Tribe (Noun)

1. any aggregate of people united by ties of descent from a common ancestor, community of customs and traditions, adherence to the same leaders, etc.
2. a local division of an aboriginal people.
3. a division of some other people.
7. a company, group, or number of persons.
8. a class or set of persons, esp. one with strong common traits or interests.
10. Roman History:
   a. any one of three divisions of the people representing the Latin, Sabine, and Etruscan settlements.
   b. any of the later political divisions of the people.
11. Greek History: a phyle (that is, "a clan or tribe based on supposed kinship").

* Excerpted from the Random House Webster's Unabridged Dictionary 3.0.