What is the meaning of calendar method?

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, rhythm, calendar method of birth control

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APA	WordNet. (2010). calendar method. Retrieved September 20, 2026, from http://smartdefine.org/calendar_method/definitions/1262667
Chicago	WordNet. 2010. "calendar method" http://smartdefine.org/calendar_method/definitions/1262667 (accessed September 20, 2026).
Harvard	WordNet 2010, calendar method, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/calendar_method/definitions/1262667>.
MLA	WordNet. "calendar method" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/calendar_method/definitions/1262667>

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