Dictionary definition · duplicate
noun
- something additional of the same kind"he always carried extras in case of an emergency"
- a copy that corresponds to an original exactly"he made a duplicate for the files"
verb
- make or do or perform again"He could never replicate his brilliant performance of the magic trick"
- duplicate or match"The polished surface twinned his face and chest in reverse"
- make a duplicate or duplicates of"Could you please duplicate this letter for me?"
- increase twofold"The population doubled within 50 years"
adjective
- identically copied from an original"a duplicate key"
- being two identical
Source: Open English WordNet (CC BY 4.0).