/ Dictionary / Index P Pasco: Meaning and Definition of Find definitions for: Pas•co Pronunciation: (pas'kō), [key] — n. a city in S Washington, on the Columbia River. 17,944. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pascin pas d'action Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language