a copy exactly like an original.

anything corresponding in all respects to something else.

Cards . a duplicate game.

to make an exact copy of.

to do or perform again; repeat

He duplicated his father's way of standing with his hands in his pockets.

to double; make twofold.

to become duplicate.

exactly like or corresponding to something else

duplicate copies of a letter.

consisting of or existing in two identical or corresponding parts; double.

Cards . noting a game in which each team plays a series of identical hands, the winner being the team making the best total score. ?

in duplicate, in two copies

esp. two identical copies

Please type the letter in duplicate.