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- DictionaryRet·ro·fit/ˌretrōˈfit/
verb
- 1. add (a component or accessory) to something that did not have it when manufactured: "drivers who retrofit catalysts to older cars"
noun
- 1. an act of adding a component or accessory to something that did not have it when manufactured: "uninsulated and oddly designed dream houses that are badly in need of a retrofit"