Dictionary  Pon•caPronunciation: (pong'ku), [key] —n., —pl. -cas, (esp. collectively) -ca for 1. 1. a member of a North American Indian people formerly of northern Nebraska, now living mostly in northern Oklahoma. 2. the Siouan language of the Ponca, mutually intelligible with Omaha. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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