incidence vs occurrent

incidence

noun
  • The act of something happening; occurrence. 

  • The falling of a point on a line, or a line on a plane. 

  • The striking of radiation or a projectile upon a surface. 

  • The manner of falling; bearing or onus, as of a tax that falls unequally. 

  • The extent or the relative frequency of something happening. 

  • A measure of the rate of new occurrence of a given medical condition in a population within a specified period of time. 

occurrent

noun
  • An event, something that occurs. 

  • One who comes to meet another. 

adj
  • Pertaining to occurrence; having to do with an occurrence. 

  • Current, actual, occurring. 

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