attachment vs retrofit

attachment

noun
  • A device attached to a piece of equipment or a tool. 

  • The means by which something is physically attached. 

  • Taking a person's property to satisfy a court-ordered debt. 

  • The act or process of (physically or figuratively) attaching. 

  • A strong bonding with or fondness for someone or something. 

  • A file sent along with a message, usually an email. 

  • The act or process by which any (downward) leader connects to any available (upward) streamer in a lightning flash. 

  • A dependence, especially a strong one. 

retrofit

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. 

verb
  • 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 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. 

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