Astronomical unit

noun

Word Frequency: 0.1

Definitions

1.noun149,597,870,700 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.

Synonyms

A. U.a. u.A.U.a.u.AU au ua ㍳moon unit steradian standard ruler parallax

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