retrofit

Noun

• the act of adding a component or accessory to something that did not have it when it was manufactured
  • the court ordered a retrofit on all automobiles
    

• a component or accessory added to something after it has been manufactured

Verb

• substitute new or modernized parts or equipment for older ones
  • The laboratory retrofitted to meet the safety codes
    

• fit in or on an existing structure, such as an older house
  • The mansion was retrofitted with modern plumbing
    

• provide with parts, devices, or equipment not available or in use at the time of the original manufacture
  • They car companies retrofitted all the old models with new carburetors