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lt-yr

1.
light-year; light-years.

light-year

[lahyt-yeer, -yeer] /ˈlaɪtˌyɪər, -ˈyɪər/
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.
  1. a very great distance, especially in development or progress:
    The new computer is light-years ahead of the old one.
  2. a very long time:
    It's been light-years since I've seen my childhood friends.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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lt yr in Science
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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