1) Characteristic of a group 2) Clan-based 3) Clan-related 4) Concerning Comanches 5) Concerning Mohawks 6) Crow-related 7) Indian-related 8) Kind of ceremony 9) Kind of council 10) Like a war dance 11) Like certain customs 12) Like clans 13) Like councils on Survivor 14) Like Cree customs 15) Like powwows 1) Ethnic 2) Racial 
• (a.) Of or pertaining to a tribe or tribes; as, a tribal scepter.
[adj] - relating to or characteristic of a tribe
adjective relating to or characteristic of a tribe; `tribal customs`
a custom or object related to a organized group of families, clans, or generations; Tribes
In addition to its use as an adjective--tribal land or tribal customs--the word is also used as a noun to describe a tribesperson, tribesman, or tribeswoman.