/ Dictionary / Index D Dalton's law: Meaning and Definition of Find definitions for: Dal'ton's law' Pronunciation: [key] — Physics, Chem. Physics,Chem. the law that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases of the mixture. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. daltonism Dalton System 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