light speed

1. 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

   Synonymsspeed of lightc

   Broaderspeedconstant

Questions about light speed

What does light speed mean?

light speed means "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".

What is another word for light speed?

Close synonyms include speed of light, c. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.