We found 32 dictionaries that define the word astronomical unit:

General (17 matching dictionaries)

1. astronomical unit: Merriam-Webster
2. astronomical unit: Oxford Learner's Dictionaries
3. astronomical unit: American Heritage Dictionary of the English Language
4. astronomical unit: Collins English Dictionary
5. Astronomical Unit: Vocabulary.com
6. astronomical unit: Wiktionary
7. astronomical unit: The Wordsmyth English Dictionary-Thesaurus
8. astronomical unit: Infoplease Dictionary
9. astronomical unit: Dictionary.com
10. Astronomical Unit, Astronomical unit: Wikipedia, the Free Encyclopedia
11. Astronomical unit: Rhymezone
12. astronomical unit: FreeDictionary.org
13. astronomical unit: Mnemonic Dictionary
14. astronomical unit: TheFreeDictionary.com
15. astronomical unit: Merriam-Webster

Business (1 matching dictionary)

16. Astronomical Unit: Financial dictionary

Computing (1 matching dictionary)

17. astronomical unit: Encyclopedia

Medicine (1 matching dictionary)

18. Astronomical Unit: Medical dictionary

Science (8 matching dictionaries)

19. From Stargazers to Starships Glossary (No longer online)
20. Astronomical Unit: Eric Weisstein's World of Astronomy
21. Imagine the Universe! Dictionary (No longer online)
22. Mars Glossary (No longer online)
23. Astronomical Unit: Extragalactic Astronomy
24. astronomical unit: Nine Planets Glossary
25. How Many? A Dictionary of Units of Measurement (No longer online)
26. ASTRONOMICAL UNIT: Zoom Astronomy Glossary

Tech (4 matching dictionaries)

27. High-Energy Astrophysics (No longer online)
28. Explosives (No longer online)
29. JPL Terms (No longer online)
30. National Weather Service Glossary (No longer online)

(Note: See astronomical_units as well.)

Definitions from Wiktionary (astronomical unit) ▸ noun:  (astronomy) 149,597,870,700 metres, the approximate mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), (symbol AU), used to measure distances in the solar system. Similar: Au, moon unit, steradian, standard ruler, parallax, lunar distance, elongation, parallax second, uranometry, apastron, more... Opposite: terrestrial unit, Earth-Sun distance, AU negative Phrases: astronomical unit (au), more... ▸ Words similar to astronomical unit ▸ Usage examples for astronomical unit ▸ Idioms related to astronomical unit ▸ Wikipedia articles (New!) ▸ Words that often appear near astronomical unit ▸ Rhymes of astronomical unit ▸ Invented words related to astronomical unit