assumption vs ipse dixit

assumption

noun
  • The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim. 

  • A festival in honor of the ascent of the Virgin Mary into heaven, celebrated on 15 August. 

  • Assumptio. 

  • The minor or second proposition in a categorical syllogism. 

  • The taking of a person up into heaven. 

  • The act of assuming, or taking to or upon oneself; the act of taking up or adopting. 

  • The thing supposed; a postulate, or proposition assumed; a supposition. 

ipse dixit

noun
  • A dogmatic and unproved proposition or dictum that is accepted solely on the authority of someone who is known to have asserted it. 

  • An authority who makes such an assertion. 

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