intent vs raison d'être

intent

noun
  • Something that is intended. 

  • The state of someone’s mind at the time of committing an offence. 

adj
  • Engrossed. 

  • Firmly fixed or concentrated on something. 

  • Unwavering from a course of action. 

raison d'être

noun
  • Reason for being. The claimed reason for the existence of something or someone; the sole or ultimate purpose of something or someone. 

How often have the words intent and raison d'être occurred in a corpus of books? (source: Google Ngram Viewer )