ret·ro·fit /ˈretrəʊfɪt $ -troʊ-/ verb (retrofitted, retrofitting) [transitiveT]to improve a machine, piece of equipment, building etc by putting new and better parts in it after it has been used for some time 〔給機器、設備〕安裝〔新部件〕;對…進行翻新改良plans to retrofit oil boilers 翻新改進燃油鍋爐的計劃
—retrofit noun [countableC]
—retrofitting noun [uncountableU]