precursory vs prior

precursory

adj
  • Being or relating to a precursor; relating to events that will follow. 

noun
  • A precursor; a sign of the onset of something. 

prior

adj
  • Advance; previous; coming before. 

  • Former, previous. 

noun
  • A high-ranking member of a monastery, usually lower in rank than an abbot. 

  • A prior probability distribution, one based on information or belief before additional data is collected. 

  • A belief supported by previous evidence or experience that one can use to make inferences about the future. 

  • A chief magistrate in Italy. 

  • A previous arrest or criminal conviction on someone's record. 

adv
  • Previously. 

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