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 ?
We must remember that light is the fastest thing known to humankind; it travels at 299,792,458 metres per second.
Although there are a number of integrated ToF sensor components and technologies available, at a very high level, all rely on the fact that light travels at a known velocity (c = 299,792,458 meters/sec).
Scientists settled on a value of exactly 299,792,458 meters per second, which then defined the meter.
This finding shows unambiguously that the propagation of light can be slowed below the commonly accepted figure of 299,792,458 metres per second, even when travelling in air or vacuum.