The Oxford Thesaurus An A-Z Dictionary of Synonyms - duplicate adj.

1) identical; twin, matching: They sent me duplicate tickets by mistake. --n. 2) (exact or carbon) copy, photocopy, machine copy, double, clone, (perfect) match, facsimile, twin, reproduction, replica, replication, look-alike, Trade Mark Xerox (copy) , Slang (dead) ringer: This painting looks like a duplicate of the one you bought. --v. 3) copy, photocopy, clone, match, replicate, imitate, reproduce, double, Trade Mark Xerox; repeat, equal: Would you please duplicate this letter for me? Can he duplicate his performance in the Commonwealth Games?