It means the average distance from Sun to Earth. It is often used as a unit of distance, within the Solar System.
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1 Astronomical Unit is 92,955,807.3 miles.
1 Astronomical Unit = 149,598,000 kilometers
1 Astronomical Unit=1.49598 × 10^13 centimeters
1 AU is approximately 149,597,870km
An astronomical unit (AU) is the mean distance from Earth to Sun, approximately 150 million km.