coincidence vs concurrence

coincidence

noun
  • Of objects, the property of being coincident; occurring at the same time or place. 

  • A coincidence point. 

  • A fixed point of a correspondence; a point of a variety corresponding to itself under a correspondence. 

  • Of events, the appearance of a meaningful connection when there is none. 

concurrence

noun
  • An instance of simultaneous occurrence. 

  • Agreement; concurring. 

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