Visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light is usually defined as having a wavelength in the range of 400 nanometres, or 400×10−9 m, to 700 nanometres – between the infrared, with longer wavelengths and the ultraviolet, with shorter wavelengths. These numbers do not represent the absolute limits of human vision, but the approximate range within which most people can see reasonably well under most circumstances. Various sources define visible light as narrowly as 420 to 680 to as broadly as 380 to 800 nm. Under ideal laboratory conditions, people can see infrared up ...

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  1. The natural medium emanating from the sun and other very hot sources (now recognised as electromagnetic radiation with a wavelength of 400-750 nm), within which vision is possible.
  2. A source of illumination.
  3. Spiritual or mental illumination; enlightenment, useful information.
  4. Facts; pieces of information; ideas, concepts.
  5. A notable person within a specific field or discipline.
  6. The manner in which the light strikes a picture; that part of a picture which represents those objects upon which the light is supposed to fall; the more illuminated part of a landscape or other scene; opposed to shade.
  7. A point of view, or aspect from which a concept, person or thing is regarded.
  8. A flame or something used to create fire.
  9. A firework made by filling a case with a substance which burns brilliantly with a white or coloured flame.
    a Bengal light
  10. A window, or space for a window in architecture.
  11. The series of squares reserved for the answer to a crossword clue.
  12. A cross-light in a double acrostic or triple acrostic.
  13. Open view; a visible state or condition; public observation; publicity.
  14. The power of perception by vision.
  15. The brightness of the eye or eyes.

Noun (etymology 2)

  1. A stone that is not thrown hard enough.


  1. To start (a fire).
    We lit the fire to get some heat.
  2. To set fire to; to set burning; to kindle.
    She lit her last match.
  3. To illuminate.
    I used my torch to light the way home through the woods in the night.
  4. To become ignited; to take fire.
    This soggy match will not light.
  5. To attend or conduct with a light; to show the way to by means of a light.

Verb (etymology 2)

  1. To unload a ship, or to jettison material to make it lighter
  2. To lighten; to ease of a burden; to take off.

Verb (etymology 3)

  1. To find by chance.
    I lit upon a rare book in a second-hand bookseller's.
  2. To alight.
    She fell out of the window but luckily lit on her feet.


  1. Having light.
  2. Pale in colour.
  3. Served with extra milk or cream.

Adjective (etymology 2)

  1. Of low weight; not heavy.
    My bag was much lighter once I had dropped off the books.
  2. Lightly-built; designed for speed or small loads.
    We took a light aircraft down to the city.
  3. Gentle; having little force or momentum.
    This artist clearly had a light, flowing touch.
  4. Easy to endure or perform.
    light duties around the house
  5. Low in fat, calories, alcohol, salt, etc.
    This light beer still gets you drunk if you have enough of it.
  6. Unimportant, trivial, having little value or significance.
    I made some light comment, and we moved on.
  7. travelling with no carriages, wagons attached
  8. Unchaste, wanton.
  9. Not heavily armed; armed with light weapons.
    light troops; a troop of light horse
  10. Not encumbered; unembarrassed; clear of impediments; hence, active; nimble; swift.
  11. Easily influenced by trifling considerations; unsteady; unsettled; volatile.
    a light, vain person; a light mind
  12. Indulging in, or inclined to, levity; lacking dignity or solemnity; frivolous; airy.
  13. Not quite sound or normal; somewhat impaired or deranged; dizzy; giddy.
  14. Not of the legal, standard, or usual weight; clipped; diminished.
    light coin


  1. Carrying little.
    I prefer to travel light.

The above text is a snippet from Wiktionary: light
and as such is available under the Creative Commons Attribution/Share-Alike License.

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