English Explanatory Dictionary

astronomical unit

English dictionary entry

Meanings

noun
  1. 149,597,870,700 metres, the approximate mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), (symbol AU), used to measure distances in the solar system.

Pronunciation

LL-Q1860 (eng)-Flame, not lame-astronomical unit.wav

Word forms

astronomical unit astronomical units

Synonyms

A.U. AU ua ㍳ a. u.
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