light speed

A form of lightspeed — The speed of light (in vacuum unless another medium is specified).

Similar
speed of lightc
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Meanings

nounlight speed (uncountable)
  1. alternativeuncountableAlternative form of lightspeed.

Synonyms & antonyms

nounthe 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
speed of lightc
Broader
speedvelocityconstant
Also see
cspeed of light

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

light speed. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/light%20speed

MLA

“light speed.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/light%20speed. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “light speed,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/light%20speed.

Source: light speed on Wiktionary, CC BY-SA 4.0.