speed of light

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Noun1.speed of light - the speed at which light travels in a vacuumspeed of light - 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
constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
speed, velocity - distance travelled per unit time
References in periodicals archive ?
MOUNTAIN TO MOUNTAIN Albert Michelson (1852-1931) conducted speed-of-light measurements in the 1920s on two southern California mountaintops.
It's part of transforming the battlefield of tomorrow by bringing speed-of-light weapons .
In effect, the signal is converted from a wave that travels at the speed of light into one that travels at the speed of sound in a semiconducting material, then back into a speed-of-light wave.