moderation vs weakening

moderation

noun
  • An instance of moderating: bringing something away from extremes, especially in a beneficial way 

  • The state or quality of being moderate; avoidance of extremes 

  • The process of moderating a discussion 

weakening

noun
  • An instance or process of loss of strength. 

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

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