Ponca(redirected from Poncas)
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n. pl. Ponca or Pon·cas
1. A member of a Native American people formerly inhabiting northeast Nebraska near the Niobrara River, with present-day populations in Oklahoma and Nebraska. The Ponca are closely related to the Omaha in language and history.
2. The Siouan language of the Ponca, dialectally related to Omaha.