Definition of rhythm noun from the Oxford Advanced American Dictionary

      

    rhythm

     noun
    noun
    NAmE//ˈrɪðəm//
     
    [uncountable, countable]
     
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  1. 1a strong, regular, repeated pattern of sounds or movements to dance to the rhythm of the music music with a fast/slow/steady rhythm jazz rhythms He can't seem to play in rhythm. The boat rocked up and down in rhythm with the water. the rhythm of her breathing abnormal heart rhythms a dancer with a natural sense of rhythm (= the ability to move in time to a fixed beat)
  2. 2 a regular pattern of changes or events the rhythm of the seasons biological/body rhythms Lack of sleep can upset your body's rhythm. see also biorhythm
See the Oxford Advanced Learner's Dictionary entry: rhythm