regeneration vs weakening

regeneration

noun
  • Rebuilding or restructuring; large scale repair or renewal. 

  • Spiritual rebirth; the change from a carnal or material life to a pious one 

  • The process by which a water softener flushes out minerals extracted from the water supply. 

  • The ability to rapidly heal substantial physical damage to one's body, or to spontaneously restore hit points. 

  • The renewal of the world at the second coming of Christ. 

weakening

noun
  • A structural principle of mathematical logic that states that the hypotheses of any derived fact may be freely extended with additional assumptions. 

  • An instance or process of loss of strength. 

How often have the words regeneration and weakening occurred in a corpus of books? (source: Google Ngram Viewer )