Astronomical Unit

/ˌˈæstrəˌnɑməkəl ˌjunət/
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Definitions of Astronomical Unit
  1. noun
    a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
    synonyms: AU
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    type of:
    astronomy unit
    a linear unit used for astronomical distances
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