POST vs gradate

POST

verb
  • To successfully perform a power-on self-test. 

noun
  • An HTTP request method used to send an arbitrary amount of data to a web server. 

gradate

verb
  • To change imperceptibly from one gradation of tone etc. to another. 

  • To arrange in order of grades. 

  • To bring to a certain strength or grade of concentration. 

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