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?