The following words and phrases shall have the meanings ascribed in this section unless the context clearly indicates otherwise:
"Abortion" means the use or prescription of any instrument, medicine, drug or any other substance or device to terminate the pregnancy of a woman known to be pregnant with an intention other than to increase the probability of a live birth, to preserve the life or health of the child after live birth or to remove a dead fetus.
"Medical emergency" means that condition which, on the basis of the physician's best clinical judgment, so complicates a pregnancy as to necessitate an immediate abortion to avert the death of the mother or for which a twenty-four-hour delay will create grave peril of immediate and irreversible loss of major bodily function.
"Probable gestational age of the unborn child" means what, in the judgment of the attending physician, will with reasonable probability be the gestational age of the unborn child at the time the abortion is planned to be performed.