Usually means: International Astronomical Union, astronomy organization.
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We found 16 dictionaries that define the word iau:

General (10 matching dictionaries)
  1. IAU: Merriam-Webster
  2. IAU: Oxford Learner's Dictionaries
  3. IAU: American Heritage Dictionary of the English Language
  4. Iau, ia'u, iau: Wordnik
  5. IAU: Wiktionary
  6. IAU: Dictionary.com
  7. IAU, Iau: Wikipedia, the Free Encyclopedia
  8. IAU: Stammtisch Beau Fleuve Acronyms
  9. IAU: TheFreeDictionary.com
  10. IAU: Merriam-Webster

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Miscellaneous (3 matching dictionaries)
  1. baby names list (No longer online)
  2. IAU: Acronym Finder
  3. AbbreviationZ (No longer online)

Science (1 matching dictionary)
  1. IAU: Extragalactic Astronomy

Slang (1 matching dictionary)
  1. iau: Urban Dictionary

Definitions from Wiktionary (IAU)

noun:  (astronomy) The main belt asteroid 5000 IAU, named after the astronomical union.
noun:  A Lakes Plain language spoken by the Turu people.
noun:  (astronomy) Initialism of International Astronomical Union (an association of professional astronomers, founded in 1919.)

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