LIGHT SPEED

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does light speed mean? 

• LIGHT SPEED (noun)
  The noun LIGHT SPEED has 1 sense:

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

  Familiarity information: LIGHT SPEED used as a noun is very rare.

 Dictionary entry details 

• LIGHT SPEED (noun)

Sense 1

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

Classified under:

Nouns denoting time and temporal relations

Synonyms:

c; light speed; speed of light

Hypernyms ("light speed" is a kind of...):

constant (a number representing a quantity assumed to have a fixed value in a specified mathematical context)

speed; velocity (distance travelled per unit time)

 Context examples 

The zone includes energetic hydrogen, oxygen and sulfur ions moving at almost light speed.

(NASA's Juno Probes the Depths of Jupiter's Great Red Spot, NASA)