retrofit

To outfit (a device, vehicle, building, or system) with newly developed or previously unavailable parts or equipment.

To install or fit (a device or system, for example) for use in or on an existing structure, especially an older dwelling.

An instance of retrofitting.

Something that has been retrofitted.

To add or substitute new parts or components to some device, structure etc., that were not previously available; to modernize

To fix an older version (or older versions) as part of the same process of fixing the newest version; to backport

Something that has been retrofitted

The act of retrofitting

of, relating to, or being a retrofit

substitute new or modernized parts or equipment for older ones