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We found 11 dictionaries with English definitions that include the word light years:
Click on the first link on a line below to go directly to a page where "light years" is defined.

General (10 matching dictionaries)

1. light-years: Merriam-Webster.com [home, info]
2. light years: Oxford Dictionaries [home, info]
3. light years: Collins English Dictionary [home, info]
4. light-years, light years: Vocabulary.com [home, info]
5. light-years: Wordnik [home, info]
6. light years: Cambridge Advanced Learner's Dictionary [home, info]
7. light-years, light years: Wiktionary [home, info]
8. light-years, light years: Dictionary.com [home, info]
9. Light Years (Chick Corea album), Light Years (Glen Campbell album), Light Years (Jamiroquai song), Light Years (Kylie Minogue album), Light Years (Pearl Jam song), Light Years (band), Light Years (film), Light Years, Light-years, Light years, The Light Years: Wikipedia, the Free Encyclopedia [home, info]
10. Light years: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

11. Light-years, Light years: Encyclopedia [home, info]

(Note: See light_year 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 ▸ Also see light_year ▸ Words similar to light years ▸ Usage examples for light years ▸ Words that often appear near light years ▸ Rhymes of light years ▸ Invented words related to light years