Dictionary
astronomical unit
noun
Definition of ASTRONOMICAL UNIT
: a unit of length used in astronomy equal to the mean distance of the earth from the sun or about 93 million miles (150 million kilometers)
See astronomical unit defined for kids ADVERTISEMENT
First Known Use of ASTRONOMICAL UNIT
1903
Learn More About ASTRONOMICAL UNIT
Browse
Next Word in the Dictionary: astronomizePrevious Word in the Dictionary: astronomical twilightAll Words Near: astronomical unit
ADVERTISEMENT
Seen & Heard
What made you want to look up astronomical unit? Please tell us where you read or heard it (including the quote, if possible).