abortifacient: A drug or combination of drugs, made artificially or from plants, that if taken orally will cause a pregnant woman to abort the embryo or fetus.

fetal viability: A biological term defining the point at which a fetus is developmentally capable of existing outside the womb; today this capability may be enhanced by modern medical technology.

Hyde amendment: An amendment to the Labor-HEW appropriations bill passed by the US Congress in December 1977 that restricts the use of federal funds for abortions to instances in which "severe and long-lasting physical health damage to the mother would result if the pregnancy were carried to term."

personhood: A legal (or moral) term denoting the point at which an embryo or fetus is considered a living person, endowed with the fundamental rights granted all persons.

Public Agenda: Self-described as an organization that aims to provide unbiased research to help American leaders better understand the public's point of view, and to help citizens know more about critical policy issues so they can make thoughtful, informed decisions.