speed of light

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Related to Weber's constant: Weber's law, Signal detection theory
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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