retrofit
noun
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.
verb
1 retrofit
Provide with parts, devices, or equipment not available or in use at the time of the original manufacture.
2 retrofit
Fit in or on an existing structure, such as an older house.
3 retrofit
Substitute new or modernized parts or equipment for older ones.
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