/ Dictionary / Index S secondary emission: Meaning and Definition of Find definitions for: sec'ondary emis'sion Pronunciation: [key] the emission of electronsfrom a material that is bombarded with electrons or ions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. secondary diagonal secondary gain Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language