retrofit

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ret·ro·fit / ˌretrōˈfit/ • v. (-fit·ted, -fit·ting) [tr.] add (a component or accessory) to something that did not have it when manufactured: drivers who retrofit catalysts to older cars. ∎  provide (something) with a component or accessory not fitted to it during manufacture: buses have been retrofitted with easy-access features.• n. an act of adding a component or accessory to something that did not have it when manufactured. ∎  a component or accessory added to something after manufacture.

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