Noah Webster
Apostasy
APOS'TASY, noun [Gr. a defection, to depart.]
1. An abandonment of what one has professed; a total desertion, or departure from one's faith or religion.
2. The desertion from a party to which one has adhered.
3. Among physicians, the throwing off of exfoliated or fractured bone, or the various solution of disease.
4. An abscess.