(retrofitted, retrofitting)with obj.
1- add (a component or accessory) to something that did not have it when manufactured加装（部件, 附件）：
motorists who retrofit catalysts to older cars.
给旧车车加装催化转换器的车手。
1.1
- provide (something) with a component or accessory not fitted to it during manufacture对…进行改装：
buses have been retrofitted with easy-access features.
公共汽车已经改装, 添加了易于登车的设备。
1
- an act of adding a component or accessory to something that did not have it when manufactured部件（或附件）的加装。
1.1
- a component or accessory added to something after manufacture（制成后）再加装的部件（或附件）。
词源
1950s: blend of RETROACTIVE and REFIT.