• WordNet 3.6
    • adj duplicate being two identical
    • adj duplicate identically copied from an original "a duplicate key"
    • v duplicate increase twofold "The population doubled within 50 years"
    • v duplicate make or do or perform again "He could never replicate his brilliant performance of the magic trick"
    • v duplicate make a duplicate or duplicates of "Could you please duplicate this letter for me?"
    • v duplicate duplicate or match "The polished surface twinned his face and chest in reverse"
    • n duplicate a copy that corresponds to an original exactly "he made a duplicate for the files"
    • n duplicate something additional of the same kind "he always carried extras in case of an emergency"
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Heavyweight tire manufacturer Goodyear is in no way affiliated with Charles Goodyear, the inventor of vulcanized rubber. They merely admired his inventiveness and his process that was so easy to duplicate that competitors simply stole it.
    • Duplicate (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 duplicate Double; twofold.
    • Duplicate That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart. "I send a duplicate both of it and my last dispatch."
    • Duplicate (Biol) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
    • Duplicate To double; to fold; to render double.
    • Duplicate To make a duplicate of (something); to make a copy or transcript of.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: The chances of an exact duplication of fingerprints are about 64 billion to 1.
    • duplicate To double; repeat; produce a second (like the first); make a copy or copies of.
    • duplicate In physiology, to divide into two by natural growth or spontaneous division: as, some in-fusorians duplicate themselves.
    • duplicate 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.
    • duplicate 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.
    • duplicate Consisting of a double number or quantity; multiplied by two.
    • duplicate 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 duplicate One of two or more things corresponding in every respect to each other.
    • n duplicate Specifically, in law and com.
    • n duplicate An instrument or writing corresponding in every particular to a first or original and of equal validity with it; an additional original.
    • n duplicate A second copy of a document, furnished by authority when the original has been lost, defaced, or invalidated.
    • n duplicate 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.
    • duplicate 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.
    • duplicate In botany, folded.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Many sharks lay eggs, but hammerheads give birth to live babies that look like very small duplicates of their parents. Young hammerheads are usually born headfirst, with the tip of their hammer-shaped head folded backward to make them more streamlined for birth.
    • Duplicate double: twofold
    • ***


  • Blaise Pascal
    “We are only falsehood, duplicity, contradiction; we both conceal and disguise ourselves from ourselves.”
  • George A. Knight
    George A. Knight
    “Dishonesty, cowardice and duplicity are never impulsive.”
  • Helen Rowland
    “A man's desire for a son is usually nothing but the wish to duplicate himself in order that such a remarkable pattern may not be lost to the world.”
  • Doug Horton
    “The key to heaven's gate cannot be duplicated.”
  • Charles Caleb Colton
    “Nothing more completely baffles one who is full of tricks and duplicity than straight forward and simple integrity in another.”
  • Susan Sontag
    “The problems of this world are only truly solved in two ways: by extinction or duplication.”


Webster's Revised Unabridged Dictionary
L. duplicatus, p. p. of duplicare, to double, fr. duplex, double, twofold. See Duplex
Chambers's Twentieth Century Dictionary
L. duplicāre, -ātumduplexduo, two, plicāre, to fold.


In literature:

Either from pain, fear, or starvation, the thing confined in the hollow tube of this awful duplicate was become torpid.
"The Devil Doctor" by Sax Rohmer
By four o'clock Tom had the apparatus perfected, and turned it over to Arv Hanson for fast duplication.
"Tom Swift and the Electronic Hydrolung" by Victor Appleton
Most mothers can, if they give the matter careful consideration, duplicate this experience from their own.
"Applied Eugenics" by Paul Popenoe and Roswell Hill Johnson
After a moment of sweet duplicity she struck up the air she had come expressly to play.
"The Eternal City" by Hall Caine
It involves too much duplicity for a man of my profession.
"Moriah's Mourning and Other Half-Hour Sketches" by Ruth McEnery Stuart
I know where there's a duplicate of that, completely underground.
"The Cosmic Computer" by Henry Beam Piper
The two pieces are first dressed exactly to the required size, either separately or by the method of making duplicate parts, see Chap.
"Handwork in Wood" by William Noyes
So we shouldn't duplicate effort.
"The Galaxy Primes" by Edward Elmer Smith
This career of duplicity could not be expected to last long.
"Tom, Dick and Harry" by Talbot Baines Reed
He has much duplicity.
"The Writings of Thomas Jefferson" by Thomas Jefferson

In poetry:

So are our lives, with days that seem
So usual, yet in truth are strange...
Such days we never duplicate;
Life is change!
"Strange Ships" by Robert A Donaldson
But he, like many a rich young man,
Through this magnificent fortune ran,
And nothing was left for his daily needs
But duplicate copies of mortgage-deeds.
"The Baby's Vengeance" by William Schwenck Gilbert
Slipping by! Slipping by!
O'er waves that duplicate the sky
I watch you daily come and go,
But rarely is there one I know
Of all who at your railings stand,
To view with joy this storied land.
"Evanescence" by John Lawson Stoddard
Many were the sins of others and you never were to blame,
Some were sins you shared in common—you must suffer all the same;
Some were sins of wasted hours with the wine cup or a mate,
But you cannot share the burden—and they come in duplicate.
"When Your Sins Come Home to Roost" by Henry Lawson

In news:

Having achieved great success in their home appellations, the owners of Haut-Brion, Pingus, Le Pin and Kendall-Jackson look to duplicate their achievements in Saint-Émilion.
State-funded projects would duplicate existing service, Frontier executive says.
In adjusting schedules, combining routes, shortening routes and eliminating duplicated service, the changes are to save about $18 million a year.
It's not easy to duplicate an industrial rock sound with just your voice(s), but the Viva Vox Choir certainly did.
The possibility of a duplicate Earth.
Some of these costumes are as old as the show itself, which can be a challenge when it comes to finding matching material for repairs or duplicate costumes .
The agency says the latter are duplicative or have few riders.
Governor missing potential of eliminating duplication.
The government's first annual marketing strategy outlines the make-up of marketing 'hubs', intended to cut duplication, and takes the bold step of projecting spend.
The forms are required under a state measure aimed at reducing duplicate homestead property tax deductions .
The county since has collected about $380,000 in back taxes/penalties from duplicate homestead deductions .
You can never duplicate a talent like that, a guy who's one of the faster guys in the league, can also throw as well as good decision making.
Can HP and Dell Duplicate IBM's Success.
And the state and federal governments would wind up duplicating each other's efforts.
Apple iPad Health Care Check-in App Cuts Duplicate Data Entry.

In science:

The we have uni T = D+ n = (1/2)(In2 + duplication matrix and the commutation matrix are related through the identity DnD+ Cn ).
Probability Distribution of Curvatures of Isosurfaces in Gaussian Random Fields
M ˜Di /50 duplicate packets would be dropped.
Optimal Delay-Throughput Trade-offs in Mobile Ad-Hoc Networks: Hybrid Random Walk and One-Dimensional Mobility Models
Note that no two duplicate packets from node i are in one relay node, so {H (i,k) [tb ]}k are mutually independent.
Optimal Delay-Throughput Trade-offs in Mobile Ad-Hoc Networks: Hybrid Random Walk and One-Dimensional Mobility Models
Now consider B-duplicate packet (i, k, j) and assume that node z, a competitive of node i, is in the V-rectangle containing the orbit of node i.
Optimal Delay-Throughput Trade-offs in Mobile Ad-Hoc Networks: Hybrid Random Walk and One-Dimensional Mobility Models
Consider a T-duplicate packet (i, k, l ) carried by node l .
Optimal Delay-Throughput Trade-offs in Mobile Ad-Hoc Networks: Hybrid Random Walk and One-Dimensional Mobility Models