<unk>  (or<unk>  dilatation) is the opening of the cervix, the entrance to the uterus, during childbirth, miscarriage, induced abortion, or gynecological surgery.<unk>  may occur naturally, or may be induced surgically or medically.
Cervical dilation
Ovarian stimulation
Pelvic massage
Menstrual extraction
Prolonged labor
Vaginal contraction
Uterine balloon tamponade
Contraceptive vaginal ring