from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (1016 metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances.
  • n. A very long way.
  • n. A very long time.


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  • (Symbol: ly) A unit of measurement of length, equal to just under ten trillion kilometres. The distance that light travels in a vacuum in one Julian year.
    Exactly 9,460,730,472,580.8 km
    About 5,878,625,373,183.61 statute miles

    May 29, 2008