Dictionary![]() ![]() de-ex•citePronunciation: (dē"ik-sīt'), [key] —v., -cit•ed, -cit•ing. Physics. —v.t. to cause (an atom) to fall from an excited energy level to a lower energy level. —v.i. to become de-excited. Also,de"ex•cite'. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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