"the piece has a fast rhythm" "the conductor set the beat"
recurring at regular intervals
an interval during which a recurring sequence of events occurs;
"the never-ending cycle of the seasons"
the arrangement of spoken words alternating stressed and unstressed elements;
"the rhythm of Frost's poetry"
natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle)