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1. Make or do or perform again
   "He could never duplicate his brilliant performance of the magic trick"
   - reduplicate, double, repeat, replicate
    
2. Duplicate or match
   "The polished surface duplicated his face and chest in reverse"
   - twin, parallel
    
3. Make a duplicate or duplicates of
   "Could you please duplicate this letter for me?"
    
4. Increase twofold
   - double

1. Something additional of the same kind
   "he always carried duplicates in case of an emergency"
   - extra
    
2. A copy that corresponds to an original exactly
   "he made a duplicate for the files"
   - duplication

1. Identically copied from an original
   "a duplicate key"
    
2. Being two identical
   - matching, twin, twinned

Derived forms: duplicated, duplicates, duplicating

See also: duplication, duplicator, matched, same

Type of: agree, artefact [Brit], artifact [N. Amer], check, copy, correspond, fit, gibe, jibe, manifold, marry, marry up, match, multiply, reproduce, tally

Encyclopedia: Duplicate