regression vs revival

regression

noun
  • An action of regressing, a return to a previous state. 

  • An analytic method to measure the association of one or more independent variables with a dependent variable. 

  • The reappearance of a bug in a piece of software that had previously been fixed. 

  • An equation using specified and associated data for two or more variables such that one variable can be estimated from the remaining variable(s). 

  • The making an exercise less straining to perform by manipulating the details of its performance like loaded weight, range of motion, angle, speed. 

  • The diminishing of a cellular mass like a tumor, or of an organ size. 

  • A psychotherapeutic method whereby healing is facilitated by inducing the patient to act out behaviour typical of an earlier developmental stage. 

  • An action of travelling mentally back in time. 

revival

noun
  • The act of reviving, or the state of being revived. 

  • Reanimation from a state of languor or depression; applied to health, a person's spirits, etc. 

  • Renewed interest in religion, after indifference and decline; a period of religious awakening; special religious interest. 

  • Renewed prevalence of something, as a practice or a fashion. 

  • A Christian religious meeting held to inspire active members of a church body or to gain new converts. 

  • Restoration of force, validity, or effect; renewal; reinstatement of a legal action. 

  • Renewed interest, performance, cultivation, or flourishing state of something, as of culture, commerce, agriculture. 

  • Revivification, as of a metal. 

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