duplicate

adjective

1. not comparable Being the same as another; identical, often having been copied from an original. This is a duplicate entry.
2. not comparable In which the hands of cards, tiles, etc. are preserved between rounds to be played again by other players. duplicate whist

verb duplicates · duplicating · duplicated

1. transitive To make a copy of. If we duplicate the information, are we really accomplishing much?

   Similar: double

2. transitive To do repeatedly; to do again. You don't need to duplicate my efforts.
3. transitive To produce something equal to. He found it hard to duplicate the skills of his wife.

Similar: dupe, duplicate, facsimilize · Opposite: dedupe, deduplicate

noun duplicates

1. countable, uncountable One that resembles or corresponds to another; an identical copy. This is a duplicate, but a very good replica.
2. countable, uncountable 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
3. countable, uncountable A pawnbroker's ticket, which must be shown when redeeming a pledged item. "Sir, I hope you will excuse what I am going to say; but having observed that you frequently pledge similar goods to these at our shop, which are afterwards taken out by other persons, I take for granted you are in the habit of selling the duplicates;[…]"

   Similar: tombstone

4. uncountable The game of duplicate bridge. The momentary madness which infects bridge players occurs frequently at rubber bridge and duplicate; and though it rarely results in murder, it often terminates marriages and close friendships[…]
5. uncountable The game of duplicate Scrabble.
6. countable, uncountable A biological specimen that was gathered alongside another specimen and represents the same species. Each collection, which may be a unicate or several specimens as duplicates in several herbaria, constitutes a record in the Conifer Database.

Similar: reproduction