/ Dictionary / Index A atomic orbital: Meaning and Definition of Find definitions for: atom'ic or'bital Pronunciation: [key] — Physics, Chem. Physics,Chem. See under(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atomic number atomic pile Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language