fitting vs retrofit

fitting

noun
  • A small part, especially a standardized or detachable part of a device or machine. 

  • The process of fitting up; especially of applying craft methods such as skilled filing to the making and assembling of machines or other products. 

  • A tube connector; a standardized connecting part of a piping system to attach sections of pipe together, such as a coupling 

  • The act of trying on clothes to inspect or adjust the fit. 

  • The action or condition of having fits in the sense of seizures or convulsions. 

  • A removable item in a house or other building, which can be taken with one when one moves out, such as a moveable piece of furniture, a carpet, picture, etc.; US furnishing; compare fixture. 

adj
  • Ready, appropriate, suitable, or in keeping 

verb
  • Getting ready; preparing. 

retrofit

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

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

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