Standard Lemma guide

retrofit

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

Usage: transitive

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

Examples

  • 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