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)
- rhythm method of birth control - rhythm method - calendar method of birth control - calendar method
the arrangement of spoken words alternating stressed and unstressed elements
"the rhythm of Frost's poetry"
- speech rhythm
an interval during which a recurring sequence of events occurs
"the never-ending cycle of the seasons"
recurring at regular intervals
- regular recurrence
the basic rhythmic unit in a piece of music
"the piece has a fast rhythm"
"the conductor set the beat"
- musical rhythm