retrofit
verb [ T ]
PRODUCTION uk/ˈretrəʊˌfɪt/ us-tt-to provide a machine with a part, or a place with equipment, that the machine or place did not have when it was built:
We're retrofitting these plants with state-of-the-art emission controls.
Bulldozers, cranes, and other types of construction equipment will be required to have their engines retrofitted.
retrofit
noun [ C ]
PRODUCTION uk/ˈretrəʊˌfɪt/ us(also retrofitting)an occasion when a machine is provided with a part, or a place is provided with equipment, that the machine or place did not have when it was built:
A full retrofit can save 25% on a trucker's fuel bill.
A scheduled retrofitting for wireless Internet had not happened.