constitution vs official opening

constitution

noun
  • The act, or process of setting something up, or establishing something; the composition or structure of such a thing; its makeup. 

  • A legal document describing such a formal system. 

  • The formal or informal system of primary principles and laws that regulates a government or other institutions. 

  • A document issued by a religious authority serving to promulgate some particular church laws or doctrines. 

  • A person's physical makeup or temperament, especially in respect of robustness. 

official opening

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