| n. 1.  A unit of sociopolitical organization consisting of a number of families, clans, or other groups who share a common ancestry and culture and among whom leadership is typically neither formalized nor permanent. 2.  A political, ethnic, or ancestral division of ancient states and cultures, especially: a.  Any of the three divisions of the ancient Romans, namely, the Latin, Sabine, and Etruscan. b.  Any of the 12 divisions of ancient Israel. c.  A phyle of ancient Greece. 3.  A group of people sharing an occupation, interest, or habit: a tribe of graduate students. 4.  Informal   A large family. 5.  Biology   A taxonomic category ranking below a family or subfamily and above a genus and usually containing several genera. [Middle English, from Old French tribu, from Latin tribus, division of the Roman people, perhaps of Etruscan origin or possibly from tri-, three; see  trei- in the Appendix of Indo-European roots.] | 
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