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astronomical unit
noun
, Astronomy.
- a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). : AU
astronomical unit
noun
- 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 × 10 11metres or about 9.3 × 10 7miles
astronomical unit
/ ăs′trə-nŏm′ĭ-kəl /
- A unit of length equal to the average distance from Earth to the Sun, approximately 149.6 million km (92.8 million mi). It is used especially to measure distances within the solar system.
- Compare light-year
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Word History and Origins
Origin of astronomical unit1
First recorded in 1900–05
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Compare Meanings
How does astronomical unit compare to similar and commonly confused words? Explore the most common comparisons:
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Example Sentences
In naming these enormous distances what astronomical unit is used?
From Project Gutenberg
That was one astronomical unit, equal to about ninety-three million miles, the distance from Earth to the sun.
From Project Gutenberg
We are, so to speak, an astronomical unit, and we affect each other for better or for worse.
From Project Gutenberg
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