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Webster's New World College Dictionary » luminescence
luminescence
luminescence definition
lu·mi·nes·cence (lo̵̅o̅′mə nes′əns)
noun
any giving off of light caused by the absorption of radiant or corpuscular energy and not by incandescence; any cold light; specif., fluorescence or phosphorescence occurring in various chemical, biological, electrical, etc. processes at relatively low temperatures
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