What does "rhythm" mean?

Rhythm: (Mus.) Movement in musical time, with periodical recurrence of accent; the measured beat or pulse which marks the character and expression of the music; symmetry of movement and accent. Moore (Encyc. )

Additional senses

  1. 2.A division of lines into short portions by a regular succession of arses and theses, or percussions and remissions of voice on words or syllables.
  2. 3.The harmonious flow of vocal sounds.

Sources