presumption vs supposition

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. 

supposition

noun
  • The act or an instance of supposing. 

  • Something that is supposed; an assumption made to account for known facts, conjecture. 

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