We found 28 dictionaries that define the word ha-ha:

General (21 matching dictionaries)

1. ha-ha: Merriam-Webster
2. ha-ha: Oxford Learner's Dictionaries
3. ha-ha, ha-ha: American Heritage Dictionary of the English Language
4. ha-ha, ha-ha: Collins English Dictionary
5. ha-ha: Vocabulary.com
6. HA-HA, Ha-Ha, Ha-ha, ha-ha: Wordnik
7. ha-ha: Cambridge Advanced Learner's Dictionary
8. ha-ha: Wiktionary
9. ha-ha: Webster's New World College Dictionary, 4th Ed.
10. ha-ha: Infoplease Dictionary
11. Ha-ha, ha-ha: Dictionary.com
12. Ha-Ha, Ha-ha: Wikipedia, the Free Encyclopedia
13. Ha-ha: Online Plain Text English Dictionary
14. ha-ha: Webster's Revised Unabridged, 1913 Edition
15. ha-ha: Rhymezone
16. Ha-ha: AllWords.com Multi-Lingual Dictionary
17. Ha-ha: Dictionary of Phrase and Fable (1898)
18. ha-ha: FreeDictionary.org
19. ha-ha: Mnemonic Dictionary
20. ha-ha: TheFreeDictionary.com
21. Ha-ha: World Wide Words

Computing (1 matching dictionary)

22. ha-ha: Encyclopedia

Miscellaneous (2 matching dictionaries)

23. Ka-BOOM! Comicbook Words on Historical Principles (No longer online)
24. ha-ha: A Word A Day

Science (1 matching dictionary)

25. Botanical Terms (No longer online)

Slang (2 matching dictionaries)

26. ha-ha, ha-ha, ha-ha: Green’s Dictionary of Slang
27. ha-ha: Urban Dictionary

Tech (1 matching dictionary)

28. Urban Conservation Glossary (No longer online)

(Note: See ha-has as well.)

Definitions from WordNet (ha-ha) ▸ noun:  a ditch with one side being a retaining wall; used to divide lands without defacing the landscape ▸ noun:  a loud laugh that sounds like a horse neighing Similar: horselaugh, haw-haw, hee-haw, sunk fence, hee haw, giggle, yaw-haw, chuckle, laugh a minute, laff, more... Opposite: sorrowful, unhappy, sad, serious, solemn Types: chuckle, guffaw, snicker, tee-hee, more... Phrases: funny ha-ha, funny ha-ha or funny peculiar, more... ▸ Words similar to ha-ha ▸ Usage examples for ha-ha ▸ Idioms related to ha-ha ▸ Wikipedia articles (New!) ▸ Popular adjectives describing ha-ha ▸ Words that often appear near ha-ha ▸ Rhymes of ha-ha ▸ Invented words related to ha-ha