noun \-ˈne-sən(t)s\

: the creation of light by processes that do not involve heat; also : the light created

Full Definition of LUMINESCENCE

:  the low-temperature emission of light (as by a chemical or physiological process); also :  light produced by luminescence
lu·mi·nes·cent \-sənt\ adjective


  1. the luminescence of the watch
  2. <we could see inside the cave even without a flashlight because of the luminescence coming from some of the fungus on the walls>


International Scientific Vocabulary lumin- + -escence
First Known Use: 1889


noun \ˌlü-mə-ˈnes-ən(t)s\   (Medical Dictionary)

Medical Definition of LUMINESCENCE

: the low-temperature emission of light produced especially by physiological processes (as in the firefly), by chemical action, by friction, or by electrical action; also : light produced by luminescence
lu·mi·nesce \-ˈnes\ intransitive verb, lu·mi·nesced lu·mi·nesc·ing
lu·mi·nes·cent \-ənt\ adjective


noun    (Concise Encyclopedia)

Process by which an excited material emits light in a process not caused solely by a rise in temperature. The excitation is usually achieved with ultraviolet radiation, X rays, electrons, alpha particles, electric fields, or chemical energy. The colour, or wavelength, of the light emitted is determined by the material, while the intensity depends on both the material and the input energy. Examples of luminescence include light emissions from neon lamps, luminescent watch dials, television and computer screens, fluorescent lamps, and fireflies. See also bioluminescence; fluorescence; phosphorescence.


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