rhythm

(noun) the basic rhythmic unit in a piece of music. Synonyms: beat, musical rhythm. Examples: "The piece has a fast rhythm." "The conductor set the beat."

(noun) recurring at regular intervals. Synonyms: regular recurrence.

(noun) an interval during which a recurring sequence of events occurs. Synonyms: cycle, round. Examples: "The never-ending cycle of the seasons."

(noun) the arrangement of spoken words alternating stressed and unstressed elements. Synonyms: speech rhythm. Examples: "The rhythm of frost's poetry."

(noun) 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). Synonyms: rhythm method of birth control, rhythm method, calendar method of birth control, calendar method.