Usually means: Distance light travels in one year.
Definitions Related words Mentions History
We found 19 dictionaries that define the word light-year:

General (13 matching dictionaries)
  1. light-year: Merriam-Webster
  2. light-year: American Heritage Dictionary of the English Language
  3. light-year: Vocabulary.com
  4. light-year: Wordnik
  5. light-year: Wiktionary
  6. light-year: Webster's New World College Dictionary, 4th Ed.
  7. light-year: The Wordsmyth English Dictionary-Thesaurus
  8. light-year: Infoplease Dictionary
  9. light-year: Dictionary.com
  10. Light-year: Wikipedia, the Free Encyclopedia
  11. light-year: FreeDictionary.org
  12. light-year: Mnemonic Dictionary
  13. light-year: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. light-year: Encyclopedia

Science (4 matching dictionaries)
  1. Light-Year: Eric Weisstein's World of Astronomy
  2. Light-Year: Extragalactic Astronomy
  3. light-year: Nine Planets Glossary
  4. LIGHT-YEAR: Zoom Astronomy Glossary

Tech (1 matching dictionary)
  1. Explosives (No longer online)

(Note: See light-years as well.)

Definitions from Wiktionary (Light-year)

noun:  Alternative spelling of light year [(astronomy) A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (10¹⁶ metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances.]

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