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A.u.
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noun
a.u.
n.
1.
(Astron.) The unit of length equal to the mean distance of the Earth from the sun, about 93 million miles (150 million kiometers); used almost exclusively in astronomy, or to describe astronomical distances.
Synonyms:
astronomical unit, AU, A.U.
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Etymology of 'A.u.'
Collaborative International Dictionary of English 0.48
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