/ Dictionary / Index C chemiluminescence: Meaning and Definition of Find definitions for: chem•i•lum•i•nes•cence Pronunciation: (kem"u-l"mu-nes'uns), [key] — n. (in chemical reactions) the emission of light by an atom or molecule that is in an excited state. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: chemiluminescence (Thesaurus) chemigraphy chemin de fer Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language