rhythm

the basic rhythmic unit in a piece of music

• “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”

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)