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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Light-year, Light year. Astron.
 1. The distance over which light can travel in a year's time in a vacuum, 5.88 trillion miles (9.46 trillion kilometers); -- used as a unit in expressing stellar distances. It is more than 63,000 times as great as the distance from the earth to the sun.  The star nearest to the earth's sun is about 4 light years distant.
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From: WordNet (r) 2.0

 light year
      n : the distance that light travels in a vacuum in 1 year; 5.88
          trillion miles or 9.46 trillion kilometers