discount vs upgrade

discount

noun
  • A lack or shortcoming. 

  • The act of one who believes, or act as though they believe, that their own feelings are more important than the reality of a situation. 

  • The rate of interest charged in discounting. 

  • A deduction made for interest, in advancing money upon, or purchasing, a bill or note not due; payment in advance of interest upon money. 

  • A reduction in price. 

adj
  • Specializing in selling goods at reduced prices. 

verb
  • To deduct from an account, debt, charge, and the like. 

  • To lend money upon, deducting the discount or allowance for interest 

  • To take into consideration beforehand; to anticipate and form conclusions concerning (an event). 

  • To believe, or act as though one believes, that one's own feelings are more important than the reality of a situation. 

  • To leave out of account or regard as unimportant. 

  • To lend, or make a practice of lending, money, abating the discount 

upgrade

noun
  • An improvement 

  • An upward grade or slope. 

  • An improved component or replacement item, usually applied to technology 

adv
  • Up a slope or grade. 

verb
  • To improve, usually applied to technology, generally by complete replacement of one or more components 

  • To replace with something better. 

  • To improve the equipment or furnishings of or services rendered to 

  • To replace a program with a later version of itself, a version having a higher version number or marketed under a more recent product name. 

  • To improve in condition or status. 

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