presupposition vs prior knowledge

presupposition

noun
  • An assumption or belief implicit in an utterance or other use of language. 

  • An assumption made beforehand; a preliminary conjecture or speculation. 

  • The act of presupposing. 

prior knowledge

noun
  • Used other than figuratively or idiomatically: see prior, knowledge. 

  • Knowledge of a set of circumstances sufficient to make actions based on those circumstances wrongful. 

  • Prior to the inception of an insurance policy, knowledge of specific extant circumstances that could reasonably give rise to a claim under that policy. 

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