light second

Noun
  1. The distance light travels in a vacuum in one second;
    Approximately 300,000 kilometers (synset 113678698)
    is a type of: astronomy unit - a linear unit used for astronomical distances
    is a part of: light year, light-year - the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

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