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light year noun

  /ˈlaɪt.jɜː/ , /ˈlaɪt.jɪə/ , /ˈlaɪt.jɪɹ/ , /ˈläːt.jøː/
  • (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.
 spatium lucis annuae
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