intention vs raison d'être

intention

noun
  • The goal or purpose. 

  • A course of action that a person intends to follow. 

  • The process of the healing of a wound. 

  • A stretching or bending of the mind toward an object or a purpose (an intent); closeness of application; fixedness of attention; earnestness. 

verb
  • To intend. 

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 intention and raison d'être occurred in a corpus of books? (source: Google Ngram Viewer )