Usually means: Low, steady, continuous background noise.
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We found 40 dictionaries that define the word hum:

General (26 matching dictionaries)
  1. hum: Merriam-Webster.com
  2. hum, hum: Oxford Learner's Dictionaries
  3. hum: American Heritage Dictionary of the English Language
  4. hum: Collins English Dictionary
  5. HUM, hum: Vocabulary.com
  6. Hum, hum: Wordnik
  7. hum: Cambridge Advanced Learner's Dictionary
  8. Hum, hum: Wiktionary
  9. hum: Webster's New World College Dictionary, 4th Ed.
  10. hum: The Wordsmyth English Dictionary-Thesaurus
  11. hum: Infoplease Dictionary
  12. hum: Dictionary.com
  13. hum: Online Etymology Dictionary
  14. hum: Cambridge Essential American English Dictionary
  15. Hum (band), Hum (disambiguation), Hum (film), Hum (sound), Hum, The Hum (Hookworms album), The Hum (O'Hooley & Tidow album), The Hum (Spring King song), The Hum, The hum: Wikipedia, the Free Encyclopedia
  16. Hum: Online Plain Text English Dictionary
  17. hum: Webster's Revised Unabridged, 1913 Edition
  18. hum: Rhymezone
  19. hum: AllWords.com Multi-Lingual Dictionary
  20. hum: Webster's 1828 Dictionary
  21. Hum: Stammtisch Beau Fleuve Acronyms
  22. hum: Free Dictionary
  23. hum: Mnemonic Dictionary
  24. hum: Dictionary/thesaurus

Art (2 matching dictionaries)
  1. Virginia Tech Multimedia Music Dictionary (No longer online)
  2. hum-, hum-: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)
  1. Hum (disambiguation), The Hum, hum: Encyclopedia

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Hum (disambiguation), hum: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. HUM: Acronym Finder
  2. HUM: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)
  4. hum: Idioms

Slang (3 matching dictionaries)
  1. hum, hum, hum, hum, hum, hum, hum, hum, hum: Green’s Dictionary of Slang
  2. hum: English slang and colloquialisms used in the United Kingdom
  3. H.U.M, Hum: Urban Dictionary

Tech (1 matching dictionary)
  1. Sweetwater Music (No longer online)

(Note: See hummable as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A hummed tune, i.e. created orally with lips closed.
noun:  An often indistinct sound resembling human humming.
noun:  Busy activity, like the buzz of a beehive.
noun:  (UK, slang) Unpleasant odour.
noun:  (dated) An imposition or hoax; humbug.
noun:  (obsolete) A kind of strong drink.
noun:  (with article) A phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people.
verb:  (intransitive) To make a sound from the vocal cords without pronouncing any real words, with one's lips closed.
verb:  (transitive) To express by humming.
verb:  (intransitive) To drone like certain insects naturally do in motion, or sounding similarly.
verb:  (intransitive) To buzz, be busily active like a beehive
verb:  (intransitive) To produce low sounds which blend continuously
verb:  (British, slang) To reek, smell bad.
verb:  (transitive, UK, dated, slang) To flatter by approving; to cajole; to deceive or impose upon; to humbug.
noun:  (informal, Malaysia, Singapore) Synonym of see hum (“blood cockles, ark clams”)
noun:  A town in the central part of Istria, northwest Croatia, 7 km from Roč.
noun:  (bridge) Initialism of highly unusual method: any of a class of contract bridge bidding systems that require advance preparation to contend with, and are usually restricted to the highest levels of tournament play.

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Colors:
    beige,     taupe,     olive,     sage,     mustard, more...



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