Synonyms: speed of light, c, light speed
Definition: 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
Similar words: constant
Definition: a number representing a quantity assumed to have a fixed value in a specified mathematical context
Usage: the velocity of light is a constant
Similar words: speed, velocity
Definition: distance travelled per unit time