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)

First Known Use of ASTRONOMICAL UNIT

1903

Browse

Next Word in the Dictionary: astronomizePrevious Word in the Dictionary: astronomical twilightAll Words Near: astronomical unit
July 03, 2015
interpellate Hear it
to formally question a public official
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears