affirmation vs declaration

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. 

declaration

noun
  • A written or oral indication of a fact, opinion, intention, belief, etc. 

  • In common law, the formal document specifying plaintiff's cause of action, including the facts necessary to sustain a proper cause of action, and to advise the defendant of the grounds upon which he is being sued. 

  • The specification of an object, such as a variable or function, establishing its existence but not necessarily describing its contents. 

  • The act, by the captain of a batting side, of declaring an innings closed. 

  • The act or process of declaring. 

  • A list of items for various legal purposes, e.g. customs declaration. 

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