from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued.
- n. The property of emitting such radiation.
- n. The radiation so emitted.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The emission of light (or other electromagnetic radiation) by a material when stimulated by the absorption of radiation or of a subatomic particle
- n. The light so emitted
from the GNU version of the Collaborative International Dictionary of English
- n. A luminescence emitted by certain substances due to the absorption of radiation at one wavelength, and the almost instantaneous re-emission of radiation at another, usually longer wavelength. The re-radiation stops almost as soon as the incident radiation is halted, thus distinguishing this phenomenon from
phosphorescence, in which re-radiation of light may continue for some time after the incident radiation is halted.
from The Century Dictionary and Cyclopedia
- n. The property possessed by some transparent substances of becoming self-luminous while they are exposed to the direct action of light-rays. See phosphorescence.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. light emitted during absorption of radiation of some other (invisible) wavelength
fluor(spar) + -escence.(American Heritage® Dictionary of the English Language, Fourth Edition)
Coined 1852 by physicist George Stokes from fluorspar + -escence (Wiktionary)