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Noun: hm  hm
  1. A metric unit of length equal to 100 meters
    - hectometer [US], hectometre [Brit, Cdn]
Interjection: h'm
  1. Gentle utterance used to call someone's attention
    - ahem, hem, hmm
     
  2. Exclamation expressing doubt, deliberation, dissent, or hesitation
    - hum, ahem, hmm

Derived forms: hms

Type of: metric linear unit

Part of: kilometer [US], kilometre [Brit, Cdn], klick, km

Encyclopedia: Hm