Abstaining from intercourse
with the wife for the purpose of preventing a pregnancy
is abortion.
What dictionary do you use?
According to dictionary.com:
Also called voluntary abortion. the removal of an embryo or fetus from the uterus in order to end a pregnancy.
2.
any of various surgical methods for terminating a pregnancy, especially during the first six months.
3.
Also called spontaneous abortion. miscarriage ( def 1 ) .
4.
an immature and nonviable fetus.
5.
abortus ( def 2b ) .
According to Webster's 1828 dictionary:
ABOR'TION, n. [L. abortio, a miscarriage; usually deduced from ab and orior.]
1. The act of miscarrying, or producing young before the natural time, or before the fetus is perfectly formed.
2. In a figurative sense, any fruit or produce that does not come to maturity, or any thing which fails in its progress, before it is matured or perfect, as a design or project.
3. The fetus brought forth before it is perfectly formed.