English Reference

Word

duplicate

Phoneticsdu·pli·cate, stress on the first syllable

/ˈdupɫəˌkeɪt/

Definitions

01an identical copy

B2 · Upper Intermediate Countable noun

n. an exact copy of something, like a document or a key.

n. an identical copy or counterpart of an original object or document.

“I keep a duplicate of my house key with a neighbor just in case.”

“The legal team requested a duplicate of the contract to ensure both parties held identical versions of the agreement.”

Synonyms

Antonyms

02legal original

C1 · Advanced Countable noun Law Formal · Technical

n. a second version of a legal paper that is just as official as the first one.

n. a document that is the same as another in all essential particulars and carries the same legal validity as the original.

“The lawyer signed the duplicate so that both offices had a valid copy.”

“In property law, a duplicate lease is executed so that the landlord and tenant each possess an original instrument of the agreement.”

Synonyms

03to make a copy

B2 · Upper Intermediate

v. to make an exact copy of something.

v. to produce an exact copy of a physical or digital object. Transitive use requiring a direct object.

“We need to duplicate these files before we start editing them.”

“The software allows users to duplicate entire databases with a single command, ensuring data redundancy across multiple servers.”

Antonyms

04to repeat an action

B2 · Upper Intermediate

v. to do something again in the same way.

v. to perform an action or process again, often with the goal of achieving the same result.

“It will be hard to duplicate the success of last year's festival.”

“Scientists struggled to duplicate the results of the initial experiment, leading to questions about the original methodology.”

Synonyms

05identical

B2 · Upper Intermediate

adj. exactly the same as another thing.

adj. being exactly the same as another; existing as a second version of an original.

“The museum has duplicate copies of several famous ancient coins.”

“The investigation revealed that the suspect had been using duplicate license plates to avoid detection by traffic cameras.”

Antonyms

Real-World Examples

“With no perfect solution yet, companies are adding different sensor systems as well as duplicating those that already come as standard to provide extra back-up.”
BBC News 1 Sept 2026
“That means the researchers found roughly 19,000 locations where sections of DNA differed because they had been duplicated, deleted, or rearranged.”
ScienceDaily 26 Jul 2026
“The Polleux lab has spent more than 15 years studying SRGAP2 , one of several dozen genes that were duplicated specifically in humans.”
ScienceDaily 1 Sept 2026

Etymology

PIE word *dwóh₁ Borrowed from Latin duplicātus, perfect passive participle of duplicō, see -ate.

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

Word family

NOUN

duplicate(B2)

Domains

BotanyLawZoology

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.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL 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: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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English Reference