Meaning of “duplicate” in the English Dictionary

"duplicate" in British English

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duplicateverb [ T ]

uk /ˈdʒuː.plɪ.keɪt/ us /ˈduː.plə.keɪt/

duplicateadjective [ before noun ]

uk /ˈdʒuː.plɪ.kət/ us /ˈduː.plə.kət/

duplicatenoun [ C ]

uk /ˈdʒuː.plɪ.kət/ us /ˈduː.plə.kət/

(Definition of “duplicate” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"duplicate" in American English

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duplicateverb [ T ]

us /ˈdu·plɪˌkeɪt/

to make an exact copy of something:

Businesses should make sure important records and files are duplicated and stored in another location.
duplicate
adjective [ not gradable ] us /ˈdu·plɪ·kət/

a duplicate key
duplication
noun [ U ] us /ˌdu·plɪˈkeɪ·ʃən/

duplicatenoun [ C ]

us /ˈdu·plɪ·kət/

something that is an exact copy of something else:

I lost the original form so they sent me a duplicate.
in duplicate

If a form is in duplicate, an exact copy has been made of it:

The application has to be completed in duplicate.
duplicate
adjective [ not gradable ] us /ˈdu·plɪ·kət/

a duplicate key

(Definition of “duplicate” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"duplicate" in Business English

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duplicateverb [ T ]

uk /ˈdjuːplɪkeɪt/ us /ˈduːplɪkeɪt/

to make an exact copy of something:

There's a machine that can duplicate nine DVDs at a time.

to do something again that has already been done, when this is unnecessary:

Some of the proposed laws duplicate those already adopted by the federal government.

to make something happen again in the same way as it happened before:

easy/difficult/impossible to duplicate Their past success might be hard to duplicate.

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duplicateadjective [ before noun ]

uk /ˈdjuːplɪkət/ us /ˈduːplɪkɪt/

made as an exact copy of something:

duplicate copy/file/record We will not be able to return the documents, so keep a duplicate copy.

done or made for a second time, especially when this is not necessary, or in order to deceive:

duplicate payment/claim Internal controls are not in place to provide for the prevention of duplicate payments.
Dishonest people filed duplicate claims or received rental assistance while living in government-paid housing.

duplicatenoun

uk /ˈdjuːplɪkət/ us /ˈduːplɪkɪt/

[ C ] an exact copy of something:

I have lost the document and my boss says she cannot provide a duplicate.
a duplicate of sth Ask the bank to send you a duplicate of the bank statement each month.
create/make/produce a duplicate
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in duplicate

if a document is in duplicate, two copies of it are made:

The government requires that all bank records be kept in duplicate.
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(Definition of “duplicate” from the Cambridge Business English Dictionary © Cambridge University Press)