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say it: REH-troh-fit
retrofit is a verb and noun meaning "provide with parts, devices, or equipment not available or in use at the time of the original manufacture". It carries 5 recorded senses.
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for retrofit come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.