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What is another word for retrofit?

What's another word for retrofit? | Here's a list of synonyms for retrofit.

Definition 1: the act of adding a component or accessory to something that did not have it when it was manufactured - [noun denoting act]

Definition 1: a component or accessory added to something after it has been manufactured - [noun denoting artifact]

Definition 1: substitute new or modernized parts or equipment for older ones - [verb of change]

Definition 1: fit in or on an existing structure, such as an older house - [verb of contact]

Definition 1: provide with parts, devices, or equipment not available or in use at the time of the original manufacture - [verb of possession]