declaration vs ipse dixit

declaration

noun
  • The act or process of declaring. 

  • 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. 

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

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

ipse dixit

noun
  • An authority who makes such an assertion. 

  • A dogmatic and unproved proposition or dictum that is accepted solely on the authority of someone who is known to have asserted it. 

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