affirmation vs verification

affirmation

noun
  • That which is affirmed; a declaration that something is true. 

  • A form of self-forced meditation or repetition; autosuggestion. 

  • The solemn declaration made by Quakers and others incapable of taking an oath. 

verification

noun
  • A formal phrase used in concluding a plea, to denote confirmation by evidence. 

  • The state of being verified. 

  • Confirmation; authentication. 

  • The operation of testing the equation of a problem, to see whether it truly expresses the conditions of the problem. 

  • The act of verifying. 

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