light-year

[ lahyt-yeer, -yeer ]

/ ˈlaɪtˌyɪər, -ˈyɪər /

noun

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

light-years,

a very great distance, especially in development or progress: The new computer is light-years ahead of the old one.
a very long time: It's been light-years since I've seen my childhood friends.

Origin of light-year

First recorded in 1885–90

Words nearby light-year

light verse, light water, lightweight, light welterweight, lightwood, light-year, lign-, lignaloes, ligne, ligneous, ligni-

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for light-year

Bearings agree, and distances check to within a light-year, which is as close as we can hope to check on as small a mass as a man.
Skylark Three|Edward Elmer Smith
One could imagine falling forty-two thousand miles, where one couldn't imagine falling a light-year.
Pariah Planet|Murray Leinster
In popular writings, another unit: a light-year, has for a very long time been employed.
Lectures on Stellar Statistics|Carl Vilhelm Ludvig Charlier
By your figuring, we shouldn't be yet one light-year on the way.
Out Around Rigel|Robert H. Wilson

That expedition perished after less than a light-year when its hydroponics system failed.
Control Group|Roger Dee

British Dictionary definitions for light-year

light year

noun

a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 10 12 kilometres or 0.3066 parsecs

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for light-year

light year

The distance traveled by light in a year (over five trillion miles); a unit for measuring distances outside the solar system. The star nearest to our sun, Alpha Centauri, is more than four light years away.

Scientific definitions for light-year

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.

单词	light-year
释义	light-year [ lahyt-yeer, -yeer ] / ˈlaɪtˌyɪər, -ˈyɪər / noun 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 light-years, a very great distance, especially in development or progress: The new computer is light-years ahead of the old one. a very long time: It's been light-years since I've seen my childhood friends. Origin of light-year First recorded in 1885–90 Words nearby light-year light verse, light water, lightweight, light welterweight, lightwood, light-year, lign-, lignaloes, ligne, ligneous, ligni- Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for light-year Bearings agree, and distances check to within a light-year, which is as close as we can hope to check on as small a mass as a man. Skylark Three\|Edward Elmer Smith One could imagine falling forty-two thousand miles, where one couldn't imagine falling a light-year. Pariah Planet\|Murray Leinster In popular writings, another unit: a light-year, has for a very long time been employed. Lectures on Stellar Statistics\|Carl Vilhelm Ludvig Charlier By your figuring, we shouldn't be yet one light-year on the way. Out Around Rigel\|Robert H. Wilson That expedition perished after less than a light-year when its hydroponics system failed. Control Group\|Roger Dee British Dictionary definitions for light-year light year noun a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 10 12 kilometres or 0.3066 parsecs Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for light-year light year The distance traveled by light in a year (over five trillion miles); a unit for measuring distances outside the solar system. The star nearest to our sun, Alpha Centauri, is more than four light years away. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Scientific definitions for light-year 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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