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  1. Oxford American Dictionary

    light year

    • IPA[ˈlīt ˌyir]

    美式

    • n.
      a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).；a long distance or great amount

    • noun: light year, plural noun: light years

    • 釋義

    名詞

    • 1. a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
    • ▪ a long distance or great amount the new range puts them light years ahead of the competition