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calendar method is a noun meaning "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)". It carries one recorded sense.
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)
Definitions, synonyms and semantic relations for calendar method come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.