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Definition of astronomical unit noun from the Oxford Advanced Learner's Dictionary

astronomical unit

noun
 
/ˌæstrənɒmɪkl ˈjuːnɪt/
 
/ˌæstrənɑːmɪkl ˈjuːnɪt/
(abbreviation AU)
(astronomy)
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  1. a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun
See astronomical unit in the Oxford Advanced American Dictionary
Check pronunciation: astronomical unit

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verb
 
 
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