noun
[ sing. ] a method of avoiding getting pregnant that involves a woman only having sex during the time of the month when she is unlikely to get pregnant
noun
[ sing. ] a method of avoiding getting pregnant that involves a woman only having sex during the time of the month when she is unlikely to get pregnant
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005