retrofit
UK: ˈrɛtrəʊfɪt | US: ˈrɛtroʊfɪt
vt. to modify or equip (a device, system, or structure) with new or updated parts after its original manufacture
n. an instance of retrofitting; a component or feature added later
The word emerged in the mid-20th century, combining retro- (indicating backward or past-oriented action) with fit (to equip). It originally described adding modern components to older machinery or structures, reflecting technological progress. The logic mirrors "looking backward to improve," capturing the essence of upgrading legacy systems.
The company plans to retrofit its factories with energy-efficient machinery.
The building’s retrofit included solar panels and smart thermostats.
Retrofitting older cars with emission controls can reduce pollution.
The retrofit of the aircraft took six months to complete.
Government grants are available to help homeowners retrofit insulation.