
Open English Wordnet
Nouns
(n)extra, duplicatesomething additional of the same kind“he always carried extras in case of an emergency” (n)duplicate, duplicationa copy that corresponds to an original exactly“he made a duplicate for the files” Verbs
(v)twin, duplicate, parallelduplicate or match“The polished surface twinned his face and chest in reverse” (v)duplicatemake a duplicate or duplicates of“Could you please duplicate this letter for me?” (v)double, duplicateincrease twofold“The population doubled within 50 years” Adjectives
(s)duplicateidentically copied from an original“a duplicate key”