backport vs retrofit

backport

verb
  • To retroactively supply to (a previous version of a software product) a fix, or a new feature, at the same time or after supplying it to the current version. 

  • To re-release software on its original or a previous platform with new features, after its release on a different platform. 

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

noun
  • An act of backporting. 

  • A software program that has been backported. 

retrofit

verb
  • 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 modernize. 

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