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We found 35 dictionaries with English definitions that include the word light year:
Click on the first link on a line below to go directly to a page where "light year" is defined.

General dictionaries General (22 matching dictionaries)
  1. light-year: Merriam-Webster.com [home, info]
  2. light year: Oxford Dictionaries [home, info]
  3. light-year: American Heritage Dictionary of the English Language [home, info]
  4. light year: Collins English Dictionary [home, info]
  5. light-year, light year: Vocabulary.com [home, info]
  6. light year: Macmillan Dictionary [home, info]
  7. light-year: Wordnik [home, info]
  8. light year: Cambridge Advanced Learner's Dictionary [home, info]
  9. light-year, light year: Wiktionary [home, info]
  10. light-year: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. light-year: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. light-year: Infoplease Dictionary [home, info]
  13. light-year, light year: Dictionary.com [home, info]
  14. light year: UltraLingua English Dictionary [home, info]
  15. Light-year, Light year (disambiguation), Light year: Wikipedia, the Free Encyclopedia [home, info]
  16. light year: Rhymezone [home, info]
  17. light-year, light year: Free Dictionary [home, info]
  18. light-year, light year: Mnemonic Dictionary [home, info]
  19. light year: LookWAYup Translating Dictionary/Thesaurus [home, info]
  20. light-year, light year: Dictionary/thesaurus [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. light-year, light year: Encyclopedia [home, info]

Miscellaneous dictionaries Miscellaneous (1 matching dictionary)
  1. light year: Wordcraft Dictionary [home, info]

Science dictionaries Science (6 matching dictionaries)
  1. Light-Year: Eric Weisstein's World of Astronomy [home, info]
  2. light year: Imagine the Universe! Dictionary [home, info]
  3. Light-Year: Extragalactic Astronomy [home, info]
  4. light-year: Nine Planets Glossary [home, info]
  5. light year (ly): How Many? A Dictionary of Units of Measurement [home, info]
  6. LIGHT-YEAR: Zoom Astronomy Glossary [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. Light Year: Urban Dictionary [home, info]

Tech dictionaries Tech (4 matching dictionaries)
  1. light year: High-Energy Astrophysics [home, info]
  2. Light year: Basics of Space Flight Glossary [home, info]
  3. Light-Year: Explosives [home, info]
  4. light-year (ly): JPL Terms [home, info]

(Note: See light_years for more definitions.)

Quick definitions from WordNet (light year)

noun:  the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

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