English Reference

Word

conversion

Phoneticscon·ver·sion, stress on the second syllable

US/kənˈvɝʒən/

UK/kənvˈɜːʃən/

Definitions

01general change

B2 · Upper Intermediate Uncountable noun

n. the act of changing something from one form or use to another.

n. the process of changing or causing something to change from one form, function, or state to another.

“The conversion of the old factory into luxury apartments took nearly two years.”

“The rapid conversion of kinetic energy into heat during the braking process can cause the mechanical components to fail if not properly ventilated.”

02religious or belief change

B2 · Upper Intermediate Countable noun

n. a change in your religion or your core beliefs.

n. the adoption of a new religion or belief system, often involving a formal process or public declaration.

“His conversion to Buddhism happened after he spent a summer traveling through Asia.”

“The historian examined the mass conversion of the local population following the arrival of the missionaries in the seventeenth century.”

Synonyms

proselytizationrebirth

Antonyms

03units or currency

B1 · Intermediate Uncountable noun

n. changing a value from one system of measurement to another.

n. the process of calculating the equivalent value of a sum or measurement in a different system.

“The online tool makes the conversion from miles to kilometers very easy.”

“Fluctuations in the exchange rate meant that the conversion of the company's overseas profits resulted in a significant loss on the balance sheet.”

04digital marketing

C1 · Advanced Countable noun Computing Technical

n. when a person sees an online ad and then does what the advertiser wants, like buying a product.

n. a marketing metric representing a user completing a desired action, such as a purchase or a newsletter sign-up.

“The new website design led to a huge increase in sales conversions.”

“The marketing team analyzed the conversion rate of the email campaign to determine which subject lines resonated most with the target demographic.”

Usage

Often used in the compound 'conversion rate'.

Synonyms

Antonyms

05legal theft

C2 · Proficiency Uncountable noun Law Formal · Technical

n. taking someone else's property and treating it as your own.

n. the civil wrong of intentionally taking or using someone else's personal property without permission.

“The company was sued for conversion after they refused to return the leased equipment.”

“The plaintiff alleged conversion, claiming the defendant had sold the disputed assets despite knowing they were subject to a lien.”

Synonyms

misappropriationtheft

Antonyms

06linguistics

C1 · Advanced Uncountable noun Science Academic · Technical

n. creating a new word by using an existing word as a different part of speech.

n. a word-formation process where a word changes its grammatical category without any change to its form.

“The word 'email' started as a noun, but through conversion, we now use it as a verb.”

“Functional conversion is a common feature of English, allowing nouns like 'Google' to transition seamlessly into verbs in everyday discourse.”

Synonyms

zero-derivation

07rugby or football score

B2 · Upper Intermediate Countable noun Sports

n. extra points scored by kicking the ball over the bar after a goal or try.

n. a successful kick at a goal after a try in rugby or a touchdown in American football.

“The kicker missed the conversion, so the team only got five points instead of seven.”

“After scoring a dramatic try in the final minute, the captain stepped up to take the conversion that would win the match.”

Synonyms

extra point

08hobby modeling

C1 · Advanced Countable noun Slang · Informal

n. changing a toy or model figure to look like a different character.

n. the modification of a miniature figure by swapping parts or using sculpting materials to create a unique model.

“He showed off his latest conversion, a robot made from three different model kits.”

“The hobbyist spent weeks on the conversion, carefully filing down the plastic joints to ensure the new limbs looked natural on the figure.”

Synonyms

modificationkitbash

Collocations

Common phrases and expressions where native English speakers use the word “conversion” in context.

Verb

01. facilitate the conversion

“New software was installed to facilitate the conversion of data into a more readable format.”

verb + noun

02. undergo a conversion

“The old warehouse is currently undergoing a conversion into luxury loft apartments.”

verb + noun

Adjective

03. seamless conversion

“The transition to the new currency was a seamless conversion that caused minimal disruption to trade.”

adj + noun

04. wholesale conversion

“The company is planning a wholesale conversion of its fleet to electric vehicles by 2030.”

adj + noun

Noun

05. conversion to socialism

“His sudden conversion to socialism surprised his conservative colleagues.”

noun + prep + noun

06. rate of conversion

“The marketing team is focused on improving the rate of conversion from website visitors to paying customers.”

noun + of + noun

Preposition

07. during the conversion

“Several technical glitches were identified during the conversion of the legacy system.”

prep + noun

Real-World Examples

“Ministers have now decided this will apply to all pubs facing the threat of conversion into another use.”
The Guardian 16 Aug 2026
“The updated National Planning Policy Framework (NPPF) will come into force on Monday and is expected to contain more protections for pubs at threat of closure for conversion to another use.”
BBC News 16 Aug 2026
“They would then have to undergo a conversion from matter into energy and back into matter, producing new baryons that move outward perpendicular to the beam.”
ScienceDaily 16 Aug 2026

Etymology

From Middle English conversion, conversioun, borrowed from Anglo-Norman conversion, from Latin conversiō, from convertō.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

NOUN

conversion(C1)

Idioms

Domains

ChemistryComputingLawLinguisticsLogicMathematics

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Common
Level
C1 · AdvancedOxford
Updated

QR code

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English Reference