/ Dictionary / Index E emission spectrum: Meaning and Definition of Find definitions for: emis'sion spec"trum Pronunciation: [key] — Physics. Physics. the spectrum formed by electromagnetic radiations emitted by a given source, characteristic of the source and the type of excitation inducing the radiations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. emission nebula emissive Related Content Daily Word Quiz: drowsy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language