fitment vs retrofit

fitment

noun
  • A thing fitted to another in order to accomplish a specific purpose. 

  • The categorisation of an employee, for the purpose of calculating salary or allowances. 

  • An item of permanent furniture or equipment. 

  • The proper positioning and orientation of a thing for it to serve its designed purpose. 

  • The act of furnishing with fitments; an instance of such an act. 

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