We found 29 dictionaries that define the word ICAO:

General (17 matching dictionaries)

1. ICAO: Merriam-Webster
2. ICAO: Oxford Learner's Dictionaries
3. ICAO: American Heritage Dictionary of the English Language
4. ICAO: Collins English Dictionary
5. ICAO: Vocabulary.com
6. ICAO: Wiktionary
7. ICAO: Webster's New World College Dictionary, 4th Ed.
8. ICAO: Infoplease Dictionary
9. ICAO: Dictionary.com
10. ICAO, Icao: Wikipedia, the Free Encyclopedia
11. Icao: Rhymezone
12. ICAO: Stammtisch Beau Fleuve Acronyms
13. icao: FreeDictionary.org
14. icao: Mnemonic Dictionary
15. ICAO: TheFreeDictionary.com
16. icao: Longman Dictionary of Contemporary English
17. ICAO: Merriam-Webster

Art (1 matching dictionary)

18. Glossary of Stamp Collecting Terms (No longer online)

Business (3 matching dictionaries)

19. Travel Industry Dictionary (No longer online)
20. eyefortransport e-commerce transportation glossary (No longer online)
21. Glossary of Trade and Shipping Terms (No longer online)

Computing (1 matching dictionary)

22. ICAO: Encyclopedia

Miscellaneous (3 matching dictionaries)

23. CIA World Factbook (No longer online)
24. ICAO: Acronym Finder
25. AbbreviationZ (No longer online)

Science (1 matching dictionary)

26. ICAO: A Dictionary of Quaternary Acronyms and Abbreviations

Tech (3 matching dictionaries)

27. ICAO: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
28. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
29. Glossary of Meteorology (No longer online)

(Note: See icaos as well.)

Definitions from Wiktionary (ICAO) ▸ noun:  Acronym of International Civil Aviation Organization; a United Nations agency headquartered in Montreal, Canada. Similar: IATA, ICAS, ICRC, Erno, icar, Arlanda, Jeppesen, ISIC, GNSS, nellis, more... Phrases: ICAO spelling alphabet, ICAO airport code, more... ▸ Words similar to ICAO ▸ Usage examples for ICAO ▸ Idioms related to ICAO ▸ Wikipedia articles (New!) ▸ Popular adjectives describing ICAO ▸ Words that often appear near ICAO ▸ Rhymes of ICAO ▸ Invented words related to ICAO