| NOUN | time | light speed, speed of light, c | the speed at which light travels in a vacuum |
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| 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. | |
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| Synonyms | speed of light, c | |
| Broader | constant | A number representing a quantity assumed to have a fixed value in a specified mathematical context |
| speed, velocity | distance travelled per unit time | |
| Spanish | velocidad de la luz | |
| Catalan | velocitat de la llum | |
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