ret·ro·fit 
/ˌrɛtroʊˈfɪt/ verb
ret·ro·fits; ret·ro·fit·ted; ret·ro·fit·ting /ˌrɛtroʊˈfɪt/ verb [+ obj] : to provide (something) with new parts that were not available when it was originally built
▪ The factory has been retrofitted to meet the new safety regulations. ▪ We can retrofit your car with the new fuel system.
▪ The factory has been retrofitted to meet the new safety regulations. ▪ We can retrofit your car with the new fuel system.
