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