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Definitions and Synonyms of speed of light | Another word for speed of light | What is speed of light?

Definition 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 - [noun denoting time]

Synonyms for speed of light in the sense of this definition

(speed of light is a kind of ...) a number representing a quantity assumed to have a fixed value in a specified mathematical context

"the velocity of light is a constant"

(speed of light is a kind of ...) distance travelled per unit time

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