1. The act of preventing the artificial prolongation of life with medication: Benemortasia allows a hopelessly sick or injured patient to die by not administering extraordinary medical measures to extend his or her condition.
2. Etymology: from Latin, bene mori, "to die well" or "a good death".

Coined in the early 1970’s by A.J. Dyck, of Harvard University, and it essentially refers to "passive euthanasia" as opposed to the generally accepted "active" implications of euthanasia.