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Atsina

noun
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At·​si·​na | \ atˈsēnə\
plural Atsina or Atsinas

Definition of Atsina

1a : an Indian people in Montana and southern Saskatchewan that are part of the Arapaho
b : a member of such people
2 : a dialect of Arapaho

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History and Etymology for Atsina

Blackfoot, literally, good people

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