- pl. -·cas or -·ca a member of a North American Indian people living in Nebraska and Oklahoma
- the Siouan language of this people, a dialect of Omaha
Origin of PoncaPonca paka, self-designation
of the Poncas or their language or culture
nounpl. Ponca Ponca or Pon·cas
- 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.
- The Siouan language of the Ponca, dialectally related to Omaha.