conclusion vs prolegomenon

conclusion

noun
  • The end or close of a pleading, for example, the formal ending of an indictment, "against the peace", etc. 

  • The outcome or result of a process or act. 

  • In an argument or syllogism, the proposition that follows as a necessary consequence of the premises. 

  • A decision reached after careful thought. 

  • An estoppel or bar by which a person is held to a particular position. 

  • The end, finish, close or last part of something. 

prolegomenon

noun
  • A prefatory discussion; a formal essay or critical discussion serving to introduce and interpret an extended work. 

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