One that resembles or corresponds to another; an identical copy.
This is a duplicate, but a very good replica.
An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original.
A pawnbroker's ticket, which must be shown when redeeming a pledged item.
The game of duplicate bridge.
The game of duplicate Scrabble.
A biological specimen that was gathered alongside another specimen and represents the same species.