light
  • adjective of little quantity
  • adjective of thin consistency
  • Electromagnetic radiation in the wavelengths perceived by human eyes, generally taken as being from 400 to 800 nanometres from violet to red. This is the part of the spectrum in which most solar energy is received on Earth, making it the best choice for animals needing to operate on the Earth’s surface, although animals other than man have eyes which respond to light in somewhat different wavelength bands from ours, and not all people respond to exactly the same light wavelengths.
  • electromagnetic radiation whose wavelength enables it to be detected by an unaided human eye. The interval of wavelengths so detectable spans from approximately 750 nanometers (red) to approximately 400 nanometers (violet). Light is currently defined as traveling at 2.99792458 × 108 meters per second. Also called light radiation, or visible radiation.
  • electromagnetic radiation of any wavelength, such as infrared, ultraviolet, or X-rays.
  • A source of light (1), such as a the sun, or a lamp.
  • The illumination provided by a light (3).

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