Well, that's no very adequate definition. Childbirth ends a pregnancy, too.
Morally, abortion is a directly intended killing of the conceived child. That would not include legitimate medical procedures which indirectly cause the child's death, e.g. removal of ectopic pregnancy, hysterectmy for uterine or cervical cancer, meds for mother's illness which trigger miscarriage, etc. --- even when this side-effect of the child's death is foreseen --- and if there is proportionate cause. Preventing the mother's death is a proportionate cause.
In the case of pre-eclampsia --- mother and child both a high risk of death --- a preterm delivery is justified to save the mother, even if the baby's survival chances are very small. There is a decisive moral difference between preterm delivery, in which the child is at least being treated with care, like a dying human being; and a dismemberment (D&E or D&X) where the baby is cut to pieces like a hunk of meat.
Ireland, which prohibits most abortions as illegal, is the country with the lowest maternal mortality rate in the world.
That's a good thing to know.
There is a close connection between abortion and disregard for women in general, and degradation of women specifically as mothers. In the name of a Satanically distorted view of "women's health," women are subjected to dangerous drugs, mutilating surgery, abortions, and a sustained societal and spiritual attack, simply because they can give birth. "D*mn those women! We've got to stop them from having babies! They're supposed to be a consequence-free sexual outlet, and that's all!"
Genuine care for women includes education, vaccines, home and medical sanitation, elimination of child marriage and polygamy, and promotion of the rule of law and free markets for whole societies. It does not include contraceptives and abortion.