/ Dictionary / Index M magic number: Meaning and Definition of Find definitions for: mag'ic num'ber Pronunciation: [key] the atomic number or neutron number of an exceptionally stable nuclide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magic mushroom magic realism Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language