duplicate Meaning, definition in Cambridge English Dictionary
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Meaning of "duplicate" - English Dictionary

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duplicateverb [T]

uk   /ˈdjuː.plɪ.keɪt/  us   /ˈduː-/
to make an exact copy of something: The documents had been duplicated. Parenthood is an experience nothing else can duplicate.

duplicateadjective [before noun]

uk   /ˈdjuː.plɪ.kət/  us   /ˈduː-/
being an exact copy of something: The thieves were equipped with duplicate keys to the safe.

duplicatenoun [C]

uk   /ˈdjuː.plɪ.kət/  us   /ˈduː-/
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.
(Definition of duplicate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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