a localized, electrically neutral, excited state that allows the transfer of energy but not electric charge through a semiconductor, insulator, etc., as an electron bound to a positive hole
Origin of excitonexcit(ation) + -on: see excite (transitive verb)
An electrically neutral excited state of an insulator or semiconductor, often regarded as a bound state of an electron and a hole.
Origin of excitonexcit(ation) -on 1
excite + -on