noun the immature product of an untimely birth.
2. abortion ·noun arrest of development of any organ, so that it remains an imperfect formation or is absorbed.
3. abortion ·noun the act of giving premature birth; particularly, the expulsion of the human fetus prematurely, or before it is capable of sustaining life; miscarriage.
4. abortion ·noun any fruit or produce that does not come to maturity, or anything which in its progress, before it is matured or perfect; a complete failure; as, his attempt proved an abortion.