briefing vs preparation

briefing

noun
  • A presentation of information or instruction; the meeting at which it is presented. 

  • A short and concise summary of a situation. 

preparation

noun
  • Devotional exercises introducing an office. 

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

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

  • The state of being prepared; readiness. 

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

  • 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. 

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