noun · verb · 12 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˌɹɛtɹəʊˈfɪt/
Received-Pronunciation:/ˈɹɛtɹə(ʊ)ˌfɪt/
General-American:/ˌɹɛtɹoʊˈfɪt/
General-American:/ˈɹɛtɹoʊˌfɪt/
Southern-England:Recorded audio is listed in the source snapshot.
CMU ARPABET:R EH1 T R OW0 F IH2 T
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
verb
Meaning 3
To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize.
Definition source: English Wiktionary via Wiktextract
Usage: transitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: backfit
Antonyms: none provided
4
verb
Meaning 4
To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc.
Definition source: English Wiktionary via Wiktextract
Usage: transitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: backfit
Antonyms: none provided
5
verb
Meaning 5
Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”).
Definition source: English Wiktionary via Wiktextract
The bug was so bad that we had to retrofit our patch to the last three releases, as well as the newest release.
Meaning relationships
Synonyms: backport
Antonyms: none provided
6
verb
Meaning 6
To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances.
Definition source: English Wiktionary via Wiktextract
Usage: figuratively, transitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
verb
Meaning 7
To supply a device, structure, etc., with new components or parts that were not previously available or installed.
Definition source: English Wiktionary via Wiktextract
Usage: intransitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
the act of adding a component or accessory to something that did not have it when it was manufactured
Definition source: Princeton WordNet 3.0
Examples
the court ordered a retrofit on all automobiles
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: addition
9
noun
Meaning 9
a component or accessory added to something after it has been manufactured
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: component, constituent, element
10
verb
Meaning 10
substitute new or modernized parts or equipment for older ones
Definition source: Princeton WordNet 3.0
Examples
The laboratory retrofitted to meet the safety codes
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: overhaul, modernize, modernise
11
verb
Meaning 11
fit in or on an existing structure, such as an older house
Definition source: Princeton WordNet 3.0
Examples
The mansion was retrofitted with modern plumbing
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: install, instal, put in, set up
12
verb
Meaning 12
provide with parts, devices, or equipment not available or in use at the time of the original manufacture
Definition source: Princeton WordNet 3.0
Examples
They car companies retrofitted all the old models with new carburetors
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: supply, provide, render, furnish
History
Etymology
The verb is derived from retro- (prefix meaning ‘back; backward’) + fit (“to equip, supply”). The noun, which is first attested later than the verb, is either derived: * from the verb (see above); or * from retro- + fit (“act of fitting; conformity of elements one to another”).
Across languages
Translations
28 source translations are retained for this English entry.
Catalan:
correcció retroactiva
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Catalan:
retroinstal·lació
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Finnish:
jälkikäteisasennus
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Finnish:
jälkikäteisasentaminen
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
German:
Nachrüsten
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
German:
Umrüsten
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Italian:
retrofit
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Japanese:
後付け
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Japanese:
あとづけ
(atozuke)
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Korean:
개비
(gaebi)
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Spanish:
corrección retroactiva
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Turkish:
teknik uyarlama
— act of supplying a device, structure, etc., with new components or parts that were not previously available or installed — see also retrofitting
Catalan:
retroinstal·lació
— change made to a device, structure, etc., by introducing components or parts that were not previously available or installed
Finnish:
jälkikäteisasennus
— change made to a device, structure, etc., by introducing components or parts that were not previously available or installed
Finnish:
jälkikäteisasennettu
— change made to a device, structure, etc., by introducing components or parts that were not previously available or installed
Catalan:
modernitzar
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Finnish:
asentaa jälkikäteen
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
German:
nachrüsten
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
German:
umrüsten
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Italian:
riequipaggiare
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Japanese:
後付けする
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Japanese:
あとづけする
(atozuke suru)
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Macedonian:
осовре́мени
(osovrémeni)
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Macedonian:
модернизи́ра
(modernizíra)
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Spanish:
modernizar
— (transitive) to supply (a device, structure, etc.) with new components or parts that were not previously available or installed — see also modernize
Finnish:
asentaa jälkikäteen
— (transitive) to add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc.
Finnish:
sovittaa
— to give new characteristics or make alterations (to someone or something) to suit them to changed circumstances
Finnish:
saada jälkikäteisasennuksena
— (intransitive) to supply a device, structure, etc., with new components or parts that were not previously available or installed