/ Dictionary / Index P progradation: Meaning and Definition of Find definitions for: pro•gra•da•tion Pronunciation: (prō"grā-dā'shun), [key] — n. Geol. seaward growth of a beach, delta, fan, etc., by progressive deposition of sediment by rivers or shoreline processes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prognostic chart program Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language