rejoinder vs thank-you note

rejoinder

noun
  • The defendant's answer to the replication. 

  • Re-insertion, typically after allowance of a patent application, of patent claims that had been withdrawn from examination under a restriction requirement. 

  • A quick response that involves disagreement or is witty, especially an answer to a question. 

  • A response that answers another response. 

verb
  • To issue a rejoinder. 

  • To say as a rejoinder. 

thank-you note

How often have the words rejoinder and thank-you note occurred in a corpus of books? (source: Google Ngram Viewer )