"retrofit" in the noun sense
1. retrofit
a component or accessory added to something after it has been manufactured
2. retrofit
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"
"retrofit" in the verb sense
1. retrofit
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"
2. retrofit
fit in or on an existing structure, such as an older house
"The mansion was retrofitted with modern plumbing"
3. retrofit
substitute new or modernized parts or equipment for older ones
"The laboratory retrofitted to meet the safety codes"
Source: WordNet® (An amazing lexical database of English)
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