abscession

noun2

1. •
   (rare) A separating; a removal; a going away.

   • […] neither justly excommunicated out of that particular Church, to which eh was orderly joyned, not excommunicating himself by voluntary Schisme, declared abscession, separation, or Apostasie. — 1659
2. •
   (no longer used) An abscess.

   • The abscession being already come to suppuration […] — 1610