preparation vs prolog

preparation

noun
  • Any of the objects placed between the strings of a prepared piano. 

  • The day before the Sabbath or other Jewish feast-day. 

  • A substance, especially a remedy, that is prepared. 

  • The state of being prepared; readiness. 

  • Devotional exercises introducing an office. 

  • The previous introduction, as an integral part of a chord, of a note continued into a succeeding dissonance. 

  • The act of preparing or getting ready. 

  • A part of any animal body preserved as a specimen. 

prolog

noun
  • A component of a computer program that prepares the computer to execute a routine. 

  • A speech or section used as an introduction, especially to a play or novel. 

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