oscillation vs perseverance

oscillation

noun
  • (of a function) defined for each point x in the domain of the function by inf diam(f(U))∣Uisaneighborhoodofx, and describes the difference (possibly ∞) between the limit superior and limit inferior of the function near that point. 

  • a single such cycle 

  • the act of oscillating or the state of being oscillated 

  • a regular periodic fluctuation in value about some mean 

perseverance

noun
  • Continuing in a course of action without regard to discouragement, opposition or previous failure. 

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