speed_of_light (HyperDic hyper-dictionary) (English)

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English 1 sense of the expression *speed of light*:
NOUN	time	speed of light, light speed, c	the speed at which light travels in a vacuum

Englishspeed of light: 1 sense noun 1, time
Meaning	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.
Synonyms	light speed, c
Broader	constant	A number representing a quantity assumed to have a fixed value in a specified mathematical context
Broader	speed, velocity	distance travelled per unit time
Spanish	velocidad de la luz
Catalan	velocitat de la llum

HyperDicEnglishSPEED ... speed of light