level set vs performance

level set

noun
  • 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. 

  • A state of mutual understanding among parties 

verb
  • To establish a baseline of mutual understanding 

performance

noun
  • A live show or concert. 

  • That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; especially, an action of an elaborate or public character. 

  • The amount of useful work accomplished estimated in terms of time needed, resources used, etc. 

  • The actual use of language in concrete situations by native speakers of a language, as opposed to the system of linguistic knowledge they possess (competence), cf. linguistic performance. 

  • The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action. 

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