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speed of light

Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics The speed of electromagnetic radiation in a perfect vacuum: exactly 299,792,458 metres per second by definition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second

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synonyms (5)

Words with the same meaning

  1. Einstein barrier
  2. Einstein constant
  3. c
  4. light speed
  5. lightspeed

hypernyms (3)

Words that are more generic or abstract

  1. constant
  2. speed
  3. velocity

relateds (8)

relateds

  1. FTL
  2. faster-than-c
  3. faster-than-light
  4. luxon
  5. subluminal
  6. superluminal
  7. tachyon
  8. tardyon

Comments

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  • whichbe commented on the word speed of light

    The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c. It is the speed of all electromagnetic radiation, including visible light, in free space. It is the speed of anything having zero rest mass. In SI units, the speed of light in a vacuum is exactly 299,792,458 metres per second (1,079,252,849 km/h). Experimental evidence has shown that the speed of light is independent of the motion of the source. It has also been confirmed experimentally that the two-way speed of light (for example from a source, to a mirror, and back again) is constant. Used to measure a light year. (Wikipedia)

    May 29, 2008