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Fluorescence
Definition 1
Fluorescence is a luminescence (i.e., optical phenomenon) in cold bodies, in which a molecule absorbs a high-energy photon, and re-emits it as a lower-energy (longer-wavelength) photon. The energy difference between the absorbed and emitted photons ends up as molecular vibrations (heat). (NCI Thesaurus)
Definition 2
The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis. (NLM, Medical Subject Headings)
Definition 3
absorption of a photon of light followed, after a delay, by emission of a photon of longer wavelength. (NIH CRISP Thesaurus)
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