retrofit
n 1: a component or accessory added to something after it has
been manufactured
2: 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"
v 1: 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"
2: fit in or on an existing structure, such as an older house;
"The mansion was retrofitted with modern plumbing"
3: substitute new or modernized parts or equipment for older
ones; "The laboratory retrofitted to meet the safety
codes"
[also: retrofitting, retrofitted]