Abortion: In medicine, an abortion is the premature exit of the products of conception (the fetus, fetal membranes, and placenta) from the uterus. It is the loss of a pregnancy and does not refer to why that pregnancy was lost.
A spontaneous abortion is the same as a miscarriage. The miscarriage of 3 or more consecutive pregnancies is termed habitual abortion.
I think it's very important to pay attention to the part which says abortion "does not refer to why that pregnancy was lost."
A woman who aborts does not necessarily have negative feelings towards the fetus. A woman who aborts does not necessarily have the intention to kill anything. A woman who aborts does not even have to have a living fetus within her body.
Antichoicers want us to think that abortion is a bad thing. It is not. Abortion is not a terribly, horrible act. It is a medical procedure, just like other medical procedures. There is nothing wrong with a woman who has an abortion, regardless of her reasons for the procedure.
The use of the term "spontaneous abortion" in reference to a miscarriage proves that the antichoice opinion of abortion is simply incorrect. Many antichoicer will fight tooth and nail to tell you that an abortion is a bad, evil thing... but a miscarriage is not.
However, we see that a miscarriage IS an abortion. This simple evidence proves that the antichoice view of abortion vs miscarriage is wrong.
We need to stop letting antichoicers control our language. We should not be afraid to say the word abortion. It's not a dirty thing. It's a life-affirming medical procedure.