/ Dictionary / Index L law of multiple proportion: Meaning and Definition of Find definitions for: law' of mul'tiple propor'tion Pronunciation: [key] — Chem. Chem. the statement that where two elements can combine to form more than one compound, the ratio by weight of one element to a given weight of the second is usually a small whole number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. law of motion law of nations Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language