Usually means: Expression of thought, doubt, consideration.
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We found 22 dictionaries that define the word Hmm:

General (15 matching dictionaries)
  1. hmm: Merriam-Webster
  2. hmm: Oxford Learner's Dictionaries
  3. hmm: Collins English Dictionary
  4. Hmm, hmm: Wordnik
  5. hmm: Cambridge Advanced Learner's Dictionary
  6. HMM, hmm: Wiktionary
  7. hmm: Webster's New World College Dictionary, 4th Ed.
  8. hmm: Dictionary.com
  9. hmm: Cambridge Essential American English Dictionary
  10. HMM, Hmm: Wikipedia, the Free Encyclopedia
  11. HMM: Stammtisch Beau Fleuve Acronyms
  12. HMM: TheFreeDictionary.com
  13. hmm: Wikimedia Commons US English Pronunciations

Computing (2 matching dictionaries)
  1. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  2. HMM: Dictionary of Algorithms and Data Structures

Medicine (1 matching dictionary)
  1. HMM: Medical dictionary

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

Tech (1 matching dictionary)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

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Definitions from Wiktionary (HMM)

▸ verb:  (intransitive) To make a thoughtful humming noise.
▸ noun:  (computer science) Initialism of hidden Markov model. [A statistical Markov model in which the system being modelled is assumed to be a Markov process with unobserved (hidden) states.]

Similar:
hurr, buzz, burr, sigh, hiss, zing, whirr, humph, thwip, huzz, more...

Opposite:
aha, oh, ah, oh yeah, ahem

Phrases:
mm hmm, HMM Algeciras, HMM Algeciras-class container ship, hmm noise, more...

Adjectives:
state, discrete, right, continuous, single, acto, standard, ergodic, based, simple, conventional

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



▸ Words similar to Hmm

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▸ Idioms related to Hmm

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▸ Popular adjectives describing Hmm

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▸ Rhymes of Hmm

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Similar:
hurr, buzz, burr, sigh, hiss, zing, whirr, humph, thwip, huzz, more...

Opposite:
aha, oh, ah, oh yeah, ahem

Phrases:
mm hmm, HMM Algeciras, HMM Algeciras-class container ship, hmm noise, more...

Adjectives:
state, discrete, right, continuous, single, acto, standard, ergodic, based, simple, conventional

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



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