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Definition of retrofit

retrofit

/ˈrɛt.roʊˌfɪt/
ret · ro · fit

Plural:retrofits
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Adjective:retrofitted
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Past Simple:retrofitted
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Past Participle:retrofitted
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Present Participle:retrofitting
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retrofit Lexical Profile

retrofit Game Scores & Validity

• verb

1

To equip or modify an existing machine, vehicle, or building with new or updated parts, technology, or features that were not available or installed at the time of its original manufacture or construction.

Example

"The city plans to retrofit all municipal buildings with solar panels and energy-efficient windows over the next five years."

Synonyms
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Antonyms
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• noun

1

An act of adding a component, accessory, or modern feature to something that did not have it when originally manufactured or constructed; the newly added component or modification itself.

Example

"The historic library underwent a seismic retrofit to protect its masonry walls against future earthquakes."

Synonyms
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Word Origin & Etymology

Coined in the mid-20th century as a blend of 'retroactive' (from Latin retro-, meaning 'backward') and 'refit', originally used in the aviation industry for upgrading aircraft already in service.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Retrofit. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/retrofit
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