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)
recurring at regular intervals
the arrangement of spoken words alternating stressed and unstressed elements; "the rhythm of Frost''s poetry"
the basic rhythmic unit in a piece of music; "the piece has a fast rhythm"; "the conductor set the beat"
an interval during which a recurring sequence of events occurs; "the neverending cycle of the seasons"
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rack means
a rapid gait of a horse in which each foot strikes the ground separately; a support for displaying various articles; "the newspapers were arranged on a rac... more