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1. (adv.) AU
astronomical unit.
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| Definition of 'AU' |
Princeton's WordNet |
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1. (noun) gold, Au, atomic number 79
a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
2. (noun) Astronomical Unit, AU
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)
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Definitions of AU 
