Definition of heartbeat noun from the Oxford Advanced American Dictionary

     

    heartbeat

     noun
    noun
    NAmE//ˈhɑrtbit//
     
     
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  1. 1[countable, uncountable] the movement or sound of the heart as it sends blood around the body a rapid/regular heartbeat
  2. 2 [singular] the heartbeat of something an important feature of something, that is responsible for making it what it is The candidate said that he understood the heartbeat of the Hispanic community in California.
  3. Idioms
    a heartbeat away (from something)
     
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    very close to something Her game is just a heartbeat away from perfection.
    in a heartbeat
     
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    very quickly, without thinking about it If I was offered another job, I'd leave in a heartbeat.
See the Oxford Advanced Learner's Dictionary entry: heartbeat