bidding vs diktat

bidding

noun
  • That which one is bidden to do; a command. 

  • The act of placing a bid. 

diktat

noun
  • a dogmatic decree or command, especially issued by one who rules without popular consent 

  • a harsh penalty or settlement imposed upon a defeated party by the victor 

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