repair vs retrofit

repair

verb
  • To make amends for, as for an injury, by an equivalent; to indemnify for. 

  • to pair again 

  • To transfer oneself to another place. 

  • To restore to good working order, fix, or improve damaged condition; to mend; to remedy. 

noun
  • The act of repairing something. 

  • The result of repairing something. 

  • The condition of something, in respect of need for repair. 

  • A place to which one goes frequently or habitually; a haunt. 

  • The act of repairing or resorting to a place. 

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 repair and retrofit occurred in a corpus of books? (source: Google Ngram Viewer )