Definition of Light-year in English :
Define Light-year in English
Light-year meaning in English
Meaning of Light-year in English
Pronunciation of Light-year in English
Light-year pronunciation in English
Pronounce Light-year in English
Light-year
see synonyms of light-yearNoun
1. light year, light-year
the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
WordNet Lexical Database for English. Princeton University. 2010.
Light-year
see synonyms of light-yearnoun
a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 1012 kilometres or 0.3066 parsecs
Collins English Dictionary. Copyright © HarperCollins Publishers
Light-year
see synonyms of light-year noun
1. Astronomy
a unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km (5,880,000,000,000 mi)
abbrev. lt-yr or ly see also parsec2.
a very great distance, amount of time, etc.
usually used in pl. light-years ahead in basic research
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.