/ Dictionary / Index C conservation of lepton number: Meaning and Definition of Find definitions for: conserva'tion of lep'ton num"ber Pronunciation: [key] — Physics. Physics. the principle that the total lepton number remains constant in any process involving elementary particles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. conservation of energy conservation of linear momentum Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language