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lightyear

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light-year

  [lahyt-yeer, -yeer]
Use lightyear in a Sentence
–noun
1. Astronomy. the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances. Abbreviation: lt-yr
2. light-years,
a. a very great distance, esp. in development or progress: The new computer is light-years ahead of the old one.
b. a very long time: It's been light-years since I've seen my childhood friends.
Origin:
1885–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
light-year  
The distance that light travels in a vacuum in one year, equal to about 9.46 trillion km (5.88 trillion mi). Light-years are used in measuring interstellar and intergalactic distances. Compare astronomical unit, parsec.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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