enlargement vs weakening

enlargement

noun
  • Diffuseness of speech or writing; a speaking at length. 

  • An act or instance of making something larger. 

  • A making more obvious or serious; exacerbation. 

  • An image, particularly a photograph, that has been enlarged. 

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 enlargement and weakening occurred in a corpus of books? (source: Google Ngram Viewer )