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light year Twit Definition of light year Share Definition of light year on Facebook Digg:Definition of light year! stumble Definition of light year Bookmark Definition of light year on Delicious submit Definition of light year to reddit Bookmark Definition of light year
noun 
  1. (astronomy) A unit of length (abbreviation ly) equal to the distance light travels in one year; used to measure extremely large distances.
  2. (in plural light years; figurative, informal) A very long way.
The marathon runner in the lead is light years ahead of the one at the back.
  1. (in plural light years; figurative, informal, nonstandard) A very long time.
Some of Leonardo da Vinci's inventions were light years ahead of their time.
Translations: 
  • Dutch: lichtjaar (1)
  • French: année-lumière (1)
  • German: Lichtjahr (1)
  • Italian: anno luce (1)
  • Spanish: aí±o luz
Etymology: light + year

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