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light year

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noun light year pronunciation in British English 
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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
    Synonyms and related words for this sense of light year
    Synonyms and related words for this sense of light year
  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.

    Synonyms and related words for this sense of light year
    Synonyms and related words for this sense of light year

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