light_speed (HyperDic hyper-dictionary)

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

English > *light speed*: 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	speed of light, 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

HyperDic: light_speed