We found 27 dictionaries that define the word humming:

General (20 matching dictionaries)

1. humming: Merriam-Webster
2. humming: Oxford Learner's Dictionaries
3. humming: Collins English Dictionary
4. humming: Vocabulary.com
5. Humming, humming: Wordnik
6. humming: Cambridge Advanced Learner's Dictionary
7. humming: Wiktionary
8. humming: Webster's New World College Dictionary, 4th Ed.
9. humming: Infoplease Dictionary
10. Humming, humming: Dictionary.com
11. humming: Cambridge Essential American English Dictionary
12. Humming (disambiguation), Humming (film), Humming: Wikipedia, the Free Encyclopedia
13. Humming: Online Plain Text English Dictionary
14. humming: Webster's Revised Unabridged, 1913 Edition
15. humming: Rhymezone
16. Humming: AllWords.com Multi-Lingual Dictionary
17. humming: Webster's 1828 Dictionary
18. humming: FreeDictionary.org
19. humming: Mnemonic Dictionary
20. humming: TheFreeDictionary.com

Computing (1 matching dictionary)

21. humming: Encyclopedia

Medicine (2 matching dictionaries)

22. online medical dictionary (No longer online)
23. humming: Medical dictionary

Miscellaneous (1 matching dictionary)

24. humming: Idioms

Slang (3 matching dictionaries)

25. humming, humming: Green’s Dictionary of Slang
26. Totally Unofficial Rap (No longer online)
27. humming: Urban Dictionary

(Note: See hum as well.)

Definitions from Wiktionary (humming) ▸ adjective:  Making a hum sound. ▸ adjective:  (archaic) Of ale or beer: very strong. ▸ noun:  The sound of something that hums; a hum. Similar: ahum, hissy, rumbly, chirpy, chirrupy, whirring, rolling, whirry, buzzy, whistly, more... Opposite: silence, quiet, stillness Types: tune, ditty, melody, air, strain, song, more... Phrases: humming bird, humming birds, humming top, humming tops, humming birds trumpet, more... Adjectives: low, soft, loud, faint, strange, deep, distant, constant, steady, gentle, monotonous Colors:     sky blue,     ruby red,     sapphire blue,     golden yellow,     lavender, more... ▸ Words similar to humming ▸ Usage examples for humming ▸ Idioms related to humming ▸ Wikipedia articles (New!) ▸ Popular adjectives describing humming ▸ Popular nouns described by humming ▸ Words that often appear near humming ▸ Rhymes of humming ▸ Invented words related to humming