retrofit

Noun
  1. A component or accessory added to something after it has been manufactured (synset 104091346)
  2. The act of adding a component or accessory to something that did not have it when it was manufactured (synset 100364879)
    "the court ordered a retrofit on all automobiles"
Verb
  1. Provide with parts, devices, or equipment not available or in use at the time of the original manufacture (synset 202366328)
    "They car companies retrofitted all the old models with new carburetors"
  2. Fit in or on an existing structure, such as an older house (synset 201572724)
    "The mansion was retrofitted with modern plumbing"
  3. Substitute new or modernized parts or equipment for older ones (synset 200263234)
    "The laboratory retrofitted to meet the safety codes"

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