| astronomical unit n. Abbr. AU A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles). |
astronomical unit
n
(Mathematics & Measurements / Units) 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 ( s tr -n m  -kl) 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-yearparsec |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  Astronomical Unit - a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)astronomy unit - a linear unit used for astronomical distances |
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