According to Merriam-Webster, some of the definitions of abortion include:
“The termination of a pregnancy after, accompanied by, resulting in, or closely followed by the death of the embryo or fetus”
“Induced expulsion of a human fetus”
According to Medical Dictionary – The Free Dictionary, the definition of abortion is:
“Termination of pregnancy before the fetus is viable. In the medical sense, this term and the term miscarriage both refer to the termination of pregnancy before the fetus is capable of survival outside the uterus. The term abortion is more commonly used as a synonym for induced abortion, the deliberate interruption of pregnancy, as opposed to miscarriage, which connotes a spontaneous or natural loss of the fetus. Because of this distinction made by the average layperson, care should be exercised in the use of the word abortion when speaking of a spontaneous loss of the fetus.