Intentional or naturally occurring termination of pregnancy before the fetus is developed enough to survive.

• Incomplete Abortion: Passage of some but not all fetal  or placental tissue from the uterus before 20 weeks'
• Induced Abortion: Intentional medical or surgical termination of pregnancy
• Elective Abortion: Induced abortion performed at the woman's request
• Therapeutic Abortion:  Induced abortion performed to preserve the mother's health or life.
• Inevitable Abortion: Opening of the cervix with uterine bleeding before 20 weeks'.
• Missed Abortion: Death of the fetus before 20 weeks' without expulsion of the fetus
• Septic abortion: Abortion accompanied by infection of the uterus.
• Spontaneous Abortion: Naturally occurring abortion before 20 weeks'. Miscarriage
• Threatened Abortion: Uterine bleeding at less than 20 weeks' without opening or other change in the cervix