We found 29 dictionaries that define the word tumbling:

General (20 matching dictionaries)

1. tumbling: Longman Dictionary of Contemporary English
2. tumbling: Merriam-Webster
3. tumbling: American Heritage Dictionary of the English Language
4. tumbling: Collins English Dictionary
5. tumbling: Vocabulary.com
6. Tumbling, tumbling: Wordnik
7. tumbling: Cambridge Advanced Learner's Dictionary
8. tumbling: Wiktionary
9. tumbling: Infoplease Dictionary
10. tumbling: Dictionary.com
11. tumbling: Cambridge Essential American English Dictionary
12. Tumbling (gymnastics), Tumbling: Wikipedia, the Free Encyclopedia
13. Tumbling: Online Plain Text English Dictionary
14. tumbling: Webster's Revised Unabridged, 1913 Edition
15. tumbling: Rhymezone
16. Tumbling: AllWords.com Multi-Lingual Dictionary
17. tumbling: Webster's 1828 Dictionary
18. tumbling: FreeDictionary.org
19. tumbling: Mnemonic Dictionary
20. tumbling: TheFreeDictionary.com

Art (1 matching dictionary)

21. Technical Glossary of Theatre Terms (No longer online)

Business (2 matching dictionaries)

22. Construction Term Glossary (No longer online)
23. tumbling: Legal dictionary

Computing (1 matching dictionary)

24. tumbling: Encyclopedia

Miscellaneous (1 matching dictionary)

25. tumbling: Idioms

Slang (1 matching dictionary)

26. tumbling: Urban Dictionary

Sports (1 matching dictionary)

27. Tumbling: Sports Definitions

Tech (2 matching dictionaries)

28. Metal Terminology (No longer online)
29. AUTOMOTIVE TERMS (No longer online)

(Note: See tumble as well.)

Definitions from Wiktionary (tumbling) ▸ noun:  The act of something that tumbles. Similar: Falling, billowing, moving, acrobatics, rolling, tumbler, tossing, tumble turn, titubation, flip turn, more... Opposite: upright, standing, stationary, stable, erect Types: handspring, somersault, tuck, pike, layout, twist, more... Phrases: tumbling barrel, tumbling mill, tumbling barrels, tumbling shaft, tumbling box, more... Colors:     cerulean,     indigo,     turquoise,     azure,     sapphire, more... ▸ Words similar to tumbling ▸ Usage examples for tumbling ▸ Idioms related to tumbling ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tumbling ▸ Words that often appear near tumbling ▸ Rhymes of tumbling ▸ Invented words related to tumbling