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light 1
(līt)
n.
1. Physics
a. Electromagnetic radiation that is visible, perceivable by the normal human eye as colors between redand violet, having frequencies between 400 terahertz and 790 terahertz and wavelengths between 750nanometers and 380 nanometers. Also called visible light.
b. Electromagnetic radiation of any frequency or wavelength.
2. The sensation of perceiving light; brightness: a sudden light that made me blink.
3.
a. A source of light, especially a lamp, a lantern, or an electric lighting fixture: Turn out the lights whenyou leave.
b. The illumination derived from a source of light: by the light of the moon.
c. The particular quantity or quality of such illumination: moved the lamp closer to get better light.
d. The pathway or route of such illumination to a person: You're standing in his light.
4.
a. A source of fire, such as a match or cigarette lighter.
b. A mechanical device that uses illumination as a signal or warning, especially a beacon or trafficsignal.
5.
a. Daylight.
b. Dawn; daybreak.
6. Something, such as a window, that admits illumination.
.