'retrofit' definitions:
Definition of 'retrofit'
(from WordNet)
noun
A component or accessory added to something after it has been manufactured
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"
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"
verb
Fit in or on an existing structure, such as an older house; "The mansion was retrofitted with modern plumbing"
verb
Substitute new or modernized parts or equipment for older ones; "The laboratory retrofitted to meet the safety codes"