/ Dictionary / Index L law of conservation of energy: Meaning and Definition of Find definitions for: law' of conserva'tion of en'ergy Pronunciation: [key] — Physics. Physics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. law of conservation of charge law of conservation of linear momentum Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language