Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: duplicatus, past participle of duplicare 'to double', from duplex; DUPLEX

duplicate

3 noun
     
duplicate3 [countable]
1 an exact copy of something that you can use in the same way
duplicate of
Locksmiths can make duplicates of most keys.
She kept both the duplicate and the original.
2

in duplicate

if something is in duplicate, there are two copies of it:
Copies of the proposal should be sent in duplicate.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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