/ Dictionary / Index D de-excite: Meaning and Definition of Find definitions for: de-ex•cite Pronunciation: (dē"ik-sīt'), [key] — v., -cit•ed, -cit•ing. —v.t. to cause (an atom) to fall from an excited energy level to a lower energy level. —v.i. to become de-excited. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Deet def Related Content Daily Word Quiz: crockery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language