Definitions for calendar method
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Princeton's WordNet
rhythm method of birth control, rhythm method, rhythm, calendar method of birth control, calendar method(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)
Wiktionary
calendar method(Noun)
A rhythm method of natural birth control.
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"calendar method." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/calendar method>.