/ Dictionary / Index O orbital angular momentum: Meaning and Definition of Find definitions for: or'bital an'gular momen'tum Pronunciation: [key] — Physics. Physics. the component of angular momentum of an electron in an atom or a nucleon in a nucleus, arising from its orbital motion rather than from its spin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orbital orbitale Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language