astronomical unit

as•troˈnom•i•cal ˈu•nit, n. [countable]

Astronomya unit of length, equal to the distance of the earth from the sun: about 93 million miles (150 million km).Abbr.: AU

as′tronom′ical u′nit, [Astron.]

Astronomya unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). Abbr.: AU

Collins Concise English Dictionary © HarperCollins Publishers::

astronomical unit n

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

'astronomical unit' also found in these entries (note: many are not synonyms or translations):

sun - au

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