light year - definition and synonyms

noun 

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singularlight year
plurallight years
  1. 1
    [countable] astronomy the distance that light travels in a year, used as a unit for measuring distances in space
  2. 2

    light years

    [plural] informal a very long way in time, distance, or quality

    Her life in Hollywood was light years away from her childhood in the East End of London.