speed of light

• Terme scientifique désignant la constante physique universelle représentant la vitesse maximale à laquelle l'énergie, la matière et l'information peuvent se déplacer dans l'Univers, soit environ 299 792 458 mètres par seconde dans le vide.

A scientific term referring to the universal physical constant representing the maximum speed at which all energy, matter, and information in the universe can travel, approximately 299,792,458 meters per second in a vacuum.

1. Physical constantB2formal

   The speed at which light travels in a vacuum, approximately 299,792,458 meters per second.

   vitesse de la lumière

   • The speed of light is a fundamental constant in physics.
   • Nothing can travel faster than the speed of light.
   • Einstein's theory of relativity is based on the speed of light.

2. Extreme speedB1informal

   Used informally to describe something that moves or happens extremely fast.

   à la vitesse de la lumière

   • The new internet connection is like the speed of light.
   • He finished the race at the speed of light.
   • She responded to the email at the speed of light.