1. (noun) any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle

• basal body temperature method
• basal body temperature method of family planning
• calendar method
• calendar method of birth control
• rhythm
• rhythm method
• rhythm method of birth control
• ovulation method
• ovulation method of family planning

1. (noun) any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle

• birth control
• birth prevention
• family planning