/ Dictionary / Index D duplation: Meaning and Definition of Find definitions for: du•pla•tion Pronunciation: (d-plā'shun, dy-), [key] — n. multiplication by two; doubling. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dupion duple Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language