- a unit of distance used in astronomy equal to the mean distance between the earth and the sun. 1 astronomical unit is equivalent to 1.495 × 1011 metres or about 9.3 × 107 miles
| 单词 | astronomical unit |
| 释义 | WordReference Random House Learner's Dictionary of American English © 2024 as•troˈnom•i•cal ˈu•nit, n. [countable] WordReference Random House Unabridged Dictionary of American English © 2024
as′tronom′ical u′nit, [Astron.]
Collins Concise English Dictionary © HarperCollins Publishers:: astronomical unit n
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