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noun
a component or accessory added to something after it has been manufactured
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verb
fit in or on an existing structure, such as an older house
"The mansion was retrofitted with modern plumbing"
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verb
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"
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verb
substitute new or modernized parts or equipment for older ones
"The laboratory retrofitted to meet the safety codes"
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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"