/ Dictionary / Index D duality principle: Meaning and Definition of Find definitions for: dual'ity prin"ciple Pronunciation: [key] — Math. Math. the principle that a mathematical duality exists under certain conditions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. duality dualize Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language