One that resembles or corresponds to another; an identical copy.

(law) 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.

(uncountable) The game of duplicate bridge.

(uncountable) The game of duplicate Scrabble.

(botany, zoology) A biological specimen that was gathered alongside another specimen and represents the same species.

(transitive) To make a copy of.

(transitive) To do repeatedly; to do again.

(transitive) To produce something equal to.

Being the same as another; identical, often having been copied from an original.

(games) In which the hands of cards, tiles, etc. are preserved between rounds to be played again by other players.