What is the meaning of rhythm?

noun

• The basic rhythmic unit in a piece of music.
  • usage: "the piece has a fast rhythm"; "the conductor set the beat"
  • synonyms: beat, musical rhythm
• Recurring at regular intervals.
  • synonyms: regular recurrence
• An interval during which a recurring sequence of events occurs.
  • usage: "the never-ending cycle of the seasons"
  • synonyms: cycle, round
• The arrangement of spoken words alternating stressed and unstressed elements.
  • usage: "the rhythm of Frost's poetry"
  • synonyms: speech rhythm
• 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