adverse possession vs tenure

adverse possession

noun
  • A means of acquiring title to another's real property without compensation by occupying the property in a manner that has under common law the requirements of being actual, open and notorious, exclusive, hostile, under cover of claim or right, and continuous for a certain number of years. 

tenure

noun
  • A right to hold land under the feudal system. 

  • A status of possessing a thing or an office; an incumbency. 

  • A period of time during which something is possessed. 

  • A status of having a permanent post with enhanced job security within an academic institution. 

verb
  • To grant tenure, the status of having a permanent academic position, to (someone). 

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