安あん全ぜん期きあんぜんきMeanings1nounsafe periodRefers to the time in a menstrual cycle when pregnancy is unlikely; often used in the context of natural family planning.安あん全ぜん期きを計けい算さんして避ひ妊にんする方ほう法ほうもある。There is also a method of contraception by calculating the safe period.
