speed of light

Noun
  1. 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 (synset 115309503)
    is a type of:
    • constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context
    • speed, velocity - distance travelled per unit time
    same as: c, light speed

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