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astronomical unit vs. light-year

astronomical unit

noun

Astronomy.

  1. a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). AU

light-year

noun

  1. Astronomy.the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances. lt-yr

  2. light-years,

    1. a very great distance, especially in development or progress.

      The new computer is light-years ahead of the old one.

    2. a very long time.

      It's been light-years since I've seen my childhood friends.