Meaning

• 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.

Meaning

• To make a copy of.

  "Can you duplicate this kind of key?"

• To do repeatedly; to do again.

  "You don't need to duplicate my efforts."

• To produce something equal to.

  "He found it hard to duplicate the skills of his wife."

Meaning

• Being the same as another; identical.

  "This is a duplicate entry."

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

  "duplicate Scrabble"