Bedeutung von “duplicate” — Learner’s Dictionary

duplicate

noun us uk /ˈdjuːplɪkət/

[ C ] something that is an exact copy of something else:

I lost my passport and had to get a duplicate.
in duplicate

If a document is in duplicate, there are two copies of it.

duplicate adjective

a duplicate key

(Definition von “duplicate noun” aus dem Cambridge Learner's Dictionary © Cambridge University Press)