retrofit

 
Pronunciation: /ˈrɛtrəʊfɪt/

verb (retrofits, retrofitting, retrofitted)

[with object]
  • add (a component or accessory) to something that did not have it when manufactured: motorists who retrofit catalysts to older cars
  • provide (something) with a component or accessory not fitted during manufacture: buses have been retrofitted with easy-access features

noun

  • an act of retrofitting a component or accessory: uninsulated and oddly designed dream houses that are badly in need of a retrofit
  • a component or accessory added to something after manufacture: the system is available as a retrofit for all makes of sprayer

Origin:

1950s: blend of retroactive and refit