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mayan:

The noun mayan has 2 senses (no senses from tagged texts)

1. Mayan, Maya -- (a member of an American Indian people of Yucatan and Belize and Guatemala who had a culture (which reached its peak between AD 300 and 900) characterized by outstanding architecture and pottery and astronomy; "Mayans had a system of writing and an accurate calendar")
2. Maya, Mayan, Mayan language -- (a family of American Indian languages spoken by Maya)

tribes:

The noun tribe has 4 senses (no senses from tagged texts)

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

mayan tribes

Project Belize
A non-profit corporation located in Nacogdoches, Texas serving the medical, dental, and eyeglasses needs of indigenous Mayan Indian tribes in Belize since 1987. Annual clinics provide opportunities for doctors, nurses, social workers, and others to serve these wonderful people who live much as they have since the year 700.
http://Projectbelize.org