Main Entry: ret·ro·fit

Pronunciation: \ˈre-trō-ˌfit, ˌre-trō-ˈfit\

Function: transitive verb

Date: 1953

1 : to furnish (as a computer, airplane, or building) with new or modified parts or equipment not available or considered necessary at the time of manufacture
2 : to install (new or modified parts or equipment) in something previously manufactured or constructed
3 : to adapt to a new purpose or need : modify <retrofit the story for a new audience>

— ret·ro·fit \ˈre-trō-ˌfit\ noun