[ik-sahy-ton, ek-si-ton]
noun Physics.
a localized, mobile excited state of a crystal, consisting of an electron and a hole bound together.

1935–40; excit(ed) or excit(ation) + -on1

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World English Dictionary
exciton (ˈɛksaɪˌtɒn)
a mobile neutral entity in a crystalline solid consisting of an excited electron bound to the hole produced by its excitation
[C20: from excit(ation) + -on]

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