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We found 5 dictionaries that define the word lightyear:

General (4 matching dictionaries)
  1. Lightyear, lightyear: Wordnik
  2. lightyear: Wiktionary
  3. lightyear: Dictionary.com
  4. Lightyear (band), Lightyear: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Lightyear: Encyclopedia

Definitions from Wiktionary (Lightyear)

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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