Verb
Provide with parts, devices, or equipment not available or in use at the time of the original manufacture
English: retrofit
Fit in or on an existing structure, such as an older house
English: retrofit
Substitute new or modernized parts or equipment for older ones
English: retrofit
Noun
A component or accessory added to something after it has been manufactured
English: retrofit
The act of adding a component or accessory to something that did not have it when it was manufactured
English: retrofit