by definition vs per se

by definition

prep
  • Necessarily; always; certainly. 

  • According to, or as a matter of, definition. 

per se

adj
  • Positing itself and being a principle of its own determination. 

adv
  • Without determination by or involvement of extraneous factors; by its very nature. 

  • In a true or literal sense; as one would expect from the name or description. 

  • Not leaving discretion to the judge to take into account additional factors that could rebut the judgment, deriving the qualification from the statute. 

  • Being a thing that posits itself and is a principle of its own determination. 

How often have the words by definition and per se occurred in a corpus of books? (source: Google Ngram Viewer )