assent vs level set

assent

noun
  • agreement; act of agreeing 

verb
  • To agree to a proposal. 

level set

noun
  • A state of mutual understanding among parties 

  • An event consisting of level setting 

  • The set of values x for which a real-valued function f(x) is equal to a given constant. 

verb
  • To establish a baseline of mutual understanding 

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