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WordNet records no synonym and no antonym for retrofit. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
provide with parts, devices, or equipment not available or in use at the time of the original manufacture
“They car companies retrofitted all the old models with new carburetors”
fit in or on an existing structure, such as an older house
“The mansion was retrofitted with modern plumbing”
substitute new or modernized parts or equipment for older ones
“The laboratory retrofitted to meet the safety codes”
a component or accessory added to something after it has been manufactured
the act of adding a component or accessory to something that did not have it when it was manufactured
“the court ordered a retrofit on all automobiles”
Synonyms, antonyms and the broader and narrower relations for retrofit come from Princeton University’s WordNet. Full sources and licences.