/ Dictionary / Index P Ponca: Meaning and Definition of Find definitions for: Pon•ca Pronunciation: (pong'ku), [key] — pl. -cas, -ca a member of a North American Indian people formerly of northern Nebraska, now living mostly in northern Oklahoma. the Siouan language of the Ponca, mutually intelligible with Omaha. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ponca (Thesaurus) Ponape Ponca City Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language