from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Identically copied from an original.
  • adj. Existing or growing in two corresponding parts; double.
  • adj. Denoting a manner of play in cards in which partnerships or teams play the same deals and compare scores at the end: duplicate bridge.
  • n. An identical copy; a facsimile.
  • n. One that corresponds exactly to another, especially an original.
  • n. Games A card game in which partnerships or teams play the same deals and compare scores at the end.
  • transitive v. To make an exact copy of.
  • transitive v. To make twofold; double.
  • transitive v. To make or perform again; repeat: a hard feat to duplicate.
  • intransitive v. To become duplicate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. being the same as another; identical. This may exclude the first identical item in a series, but usage is inconsistent.
  • v. to make a copy of
  • v. to do repeatedly; to do again
  • v. to produce something equal to
  • n. One that resembles or corresponds to another; an identical copy.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Double; twofold.
  • n. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
  • n. 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.
  • transitive v. To double; to fold; to render double.
  • transitive v. To make a duplicate of (something); to make a copy or transcript of.
  • transitive v. To divide into two by natural growth or spontaneous action.

from The Century Dictionary and Cyclopedia

  • To double; repeat; produce a second (like the first); make a copy or copies of.
  • In physiology, to divide into two by natural growth or spontaneous division: as, some in-fusorians duplicate themselves.
  • To become double; repeat or be repeated; specifically, in ecclesiastical use, to celebrate the mass or holy communion twice in the same day. See duplication.
  • Double; twofold; consisting of or relating to a pair or pairs, or to two corresponding parts: as, duplicate spines in an insect; duplicate examples of an ancient coin; duplicate proportion.
  • Consisting of a double number or quantity; multiplied by two.
  • Exactly like or corresponding to something made or done before; repeating an original; matched: as, there are many duplicate copies of this picture; a duplicate action or proceeding.
  • n. One of two or more things corresponding in every respect to each other.
  • n. Specifically, in law and com.
  • n. An instrument or writing corresponding in every particular to a first or original and of equal validity with it; an additional original.
  • n. A second copy of a document, furnished by authority when the original has been lost, defaced, or invalidated.
  • n. One of two or more things each of which corresponds in all essential respects to an original, type, or pattern; another corresponding to a first or original; another of the same kind; a copy: as, a duplicate of a bust.
  • In whist and bridge, to play the same cards over again, as nearly as possible under the same conditions, each side getting the hands originally held by its opponents.
  • In botany, folded.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. something additional of the same kind
  • adj. being two identical
  • n. a copy that corresponds to an original exactly
  • v. make a duplicate or duplicates of
  • v. duplicate or match
  • adj. identically copied from an original
  • v. make or do or perform again
  • v. increase twofold


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Latin duplicātus, past participle of duplicāre, to double, from duplex, duplic-, twofold; see dwo- in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin duplicatus (past participle of duplicare).


  • Interestingly, if they had published a shared announcement they would have given an example of what many people think of when they hear the term duplicate content - the same copy / text / content on different websites.

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  • Last month it sought permission to destroy what it called duplicate loan files because the $45,000-a-month storage cost was an "unnecessary burden" on the company.

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  • The suit contends that names were cut from the rolls after the Colorado Republican Party provided the state with a list of what it called duplicate registrations.

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  • The same relation holds when comparing only hub duplicate pairs, which we defined as duplicate pairs where at least one paralog has a PPI degree ≥ 20.

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  • He wanted to make a copy and insert his own name on it, saying he had lost his original and was having trouble getting a duplicate from the government.

    David David

  • I swear, I figure out how to post and then I end up somehow sending things out in duplicate, all with misspelled words (yes, I know, I'm terrible here too, but I already say I'm an idiot in the title of this LJ.)

    Day in the Life of an Idiot

  • These shorthand notes, transcribed and typed in duplicate, were the nightmare and, on occasion, the Nemesis, of the managers and foremen.


  • Please find herewith a contract in duplicate for your next book which we have taken the liberty of forwarding to you.

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  • Upon completion, he shall provide paperwork [printed from the NCIS system no doubt], in duplicate, to the buyer and seller indicating the identity of the gun and confirming the eligibility of the former.

    The Volokh Conspiracy » Mayor Bloomberg’s gun show bill

  • Regardless of how much cost there was to make the first complete song and copy, the cost to make a duplicate is basically zero.

    Matthew Yglesias » The Futile Struggle Against Free Content


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  • dont duplicate others work

    January 28, 2013