/ Dictionary / Index E exciton: Meaning and Definition of Find definitions for: ex•ci•ton Pronunciation: (ik-sī'ton, ek'si-ton"), [key] — n. Physics. a localized, mobile excited state of a crystal, consisting of an electron and a hole bound together. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. excitomotor excitor Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language