presumption vs presupposition

presumption

noun
  • the act of presuming, or something presumed 

  • the condition upon which something is presumed 

  • the belief of something based upon reasonable evidence, or upon something known to be true 

  • An inference that a trier of fact is either permitted or required to draw under certain factual circumstances (as prescribed by statute or case law) unless the party against whom the inference is drawn is able to rebut it with admissible, competent evidence. 

presupposition

noun
  • The act of presupposing. 

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

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

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