calculate vs retrofit

calculate

verb
  • To adjust for purpose; to adapt by forethought or calculation; to fit or prepare by the adaptation of means to an end. 

  • To determine values or solutions by a mathematical process; reckon. 

  • To plan; to expect; to think. 

  • To ascertain or predict by mathematical or astrological computations the time, circumstances, or other conditions of; to forecast or compute the character or consequences of. 

  • To determine the value of something or the solution to something by a mathematical process. 

  • To imagine sequences of potential moves and responses without actually moving the pieces. 

retrofit

verb
  • To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances. 

  • To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize. 

  • Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”) 

  • To supply a device, structure, etc., with new components or parts that were not previously available or installed. 

  • To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc. 

noun
  • An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting. 

  • A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed. 

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