Definition of "regeneration"

regeneration

noun
countable and uncountable, plural regenerations
1. Rebuilding or restructuring; large scale repair or renewal.
2. (theology) Spiritual rebirth; the change from a carnal or material life to a pious one
3. (Christianity) The renewal of the world at the second coming of Christ.
4. The process by which a water softener flushes out minerals extracted from the water supply.
5. (roleplaying games, fantasy) The ability to rapidly heal substantial physical damage to one's body, or to spontaneously restore hit points.
  Quotations
  The standard ring of regeneration restores one point of damage per turn (and will eventually replace lost limbs or organs).
  1995, David Zeb Cook, Jean Rabe, Warren Spector, Dungeon master guide for the AD&D game, page 202
  Regeneration does not restore hit points lost from starvation, thirst, or suffocation.
  2003, Bastion Press, E. W. Morton, Out for Blood