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luminescence lu·mi·nes·cence (lōō'mə-něs'əns)n.
The emission of light that does not derive energy from the temperature of the emitting body, as in fluorescence and bioluminescence.
The light so emitted.
The emission of light as a result of the excitation of atoms by energy other than heat. Bioluminescence, fluorescence, and phosphorescence are examples of luminescence that can be produced by biological or chemical processes.
The light produced in this way.