incept vs usher in

incept

verb
  • To begin. 

  • To take in or ingest. 

  • To put an idea into a person's mind so deeply that they believe it was their own. Inspired by the movie Inception (2010) and used by Mark Zuckerberg & Yuval Noah Harari in Conversation at 01:23:00. 

  • To be accepted to the Master of Arts degree at Oxford or Cambridge University. 

usher in

verb
  • To begin something with preparatory material; to introduce. 

  • To announce the arrival of something; to herald. 

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