(1):
(n.) 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.
(2):
(n.) The harmonious flow of vocal sounds.
(3):
(n.) 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):
(n.) 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.