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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

2. • 釋義

   n.

   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