speed of light

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Noun[edit]

speed of light (uncountable) (abbreviated as c)

  1. (physics) The speed of electromagnetic radiation in a perfect vacuum: exactly 299,792,458 metres per second by definition.
    • 2011 September 22, Nick Collins, “Speed of light 'broken' by scientists”, Daily Telegraph:
      The science world was left in shock when workers at the world's largest physics lab announced they had recorded subatomic particles travelling faster than the speed of light – a feat that Einstein said was impossible.

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