Rhythm

Part of speech: noun (n.)

1. In the widest sense, a dividing into short portions by a regular succession of motions, impulses, sounds, accents, etc., producing an agreeable effect, as in music poetry, the dance, or the like.

2. 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. )

3. 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.

4. The harmonious flow of vocal sounds.