American Heritage® Dictionary of the English Language, Fourth Edition
- n. A birth-control method dependent on abstinence during the period of ovulation.
- n. A method of natural birth control that involves counting days of a woman's menstrual cycle in order to determine when sexual intercourse is most or least likely to result in pregnancy.
- n. 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)
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