Duplication, duplicate, and duplicator may refer to:

Biology and genetics

Gene duplication Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution. It can be defined as any duplication of a region of DNA that contains a gene ...

, a process which can result in free mutation *

Chromosomal duplication Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution. It can be defined as any duplication of a region of DNA that contains a gene. ...

, which can cause Bloom and Rett syndrome *

Polyploidy Polyploidy is a condition in which the cells of an organism have more than two paired sets of ( homologous) chromosomes. Most species whose cells have nuclei (eukaryotes) are diploid, meaning they have two complete sets of chromosomes, one fro ...

, a phenomenon also known as ''ancient genome duplication'' * Enteric duplication cysts, certain portions of the gastrointestinal tract * Diprosopus, a form of cojoined twins also known as ''craniofacial duplication'' *

Diphallia Diphallia, penile duplication (PD), diphallic terata, or diphallasparatus is an extremely rare developmental abnormality in which a male is born with two Human penis, penises. The first reported case was by Johannes Jacob Wecker in 1609. Its occu ...

, a medical condition also known as ''penile duplication''

Computing

Duplicate code In computer programming, duplicate code is a sequence of source code that occurs more than once, either within a program or across different programs owned or maintained by the same entity. Duplicate code is generally considered Code smell, undesira ...

, a source code sequence that occurs more than once in a program *

Duplicate characters in Unicode Unicode has a certain amount of duplication of characters. These are pairs of single Unicode code points that are canonically equivalent. The reason for this are compatibility issues with legacy systems. Unless two characters are canonically eq ...

, pairs of single Unicode code points that are canonically equivalent. The reason for this are compatibility issues with legacy systems * Data redundancy, either wanted or unwanted (in which case one resorts to

data deduplication In computing, data deduplication is a technique for eliminating duplicate copies of repeating data. Successful implementation of the technique can improve storage utilization, which may in turn lower capital expenditure by reducing the overall amou ...

) * Content copying through

cut, copy, and paste Cut, copy, and paste are essential commands of modern human–computer interaction and user interface design. They offer an interprocess communication technique for transferring data through a computer's user interface. The ''cut'' command rem ...

File copying In computing, file copying is the act of creating a new file such that it has the same content as an existing file. The operation is sometimes called ''cloning''. Generally, an operating system command-line shell provides for file copying v ...

Mathematics

* Duplication, or doubling,

multiplication Multiplication is one of the four elementary mathematical operations of arithmetic, with the other ones being addition, subtraction, and division (mathematics), division. The result of a multiplication operation is called a ''Product (mathem ...

by 2 * Duplication matrix, a linear transformation dealing with half-vectorization *

Doubling the cube Doubling the cube, also known as the Delian problem, is an ancient geometry, geometric problem. Given the Edge (geometry), edge of a cube, the problem requires the construction of the edge of a second cube whose volume is double that of the first ...

, a problem in geometry also known as ''duplication of the cube'' * A type of

multiplication theorem In mathematics, the multiplication theorem is a certain type of identity obeyed by many special functions related to the gamma function. For the explicit case of the gamma function, the identity is a product of values; thus the name. The various ...

called the ''Legendre duplication formula'' or simply "duplication formula"

Technology

Duplicating machines Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, image scanner, scanners, laser printers, and photocopiers, but for many years they were the primary means o ...

, machines and processes designed to reproduce printed material, photocopying being among the best-known today; see also

List of duplicating processes This is a partial list of text and image duplicating processes used in business and government from the Industrial Revolution forward. Some are mechanical and some are chemical. There is naturally some overlap with printing processes and photogra ...

Loop bin duplicator A loop bin duplicator is a specialized audio tape machine used in the duplication of pre-recorded audio cassettes and 8-track cartridges. Digital loop bin duplicators were first introduced in the early 1990s. They had fewer moving parts than pre ...

, a device designed to copy pre-recorded audio tapes *

Double track A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track. Overview In the earliest days of railways in the United Kingdom, most li ...

, a method of railway design also known as ''track duplication'' * In

road construction A road is a thoroughfare used primarily for movement of traffic. Roads differ from streets, whose primary use is local access. They also differ from stroads, which combine the features of streets and roads. Most modern roads are paved. The ...

, conversion of a single carriageway into Dual carriageway

Art and fiction

* ''Duplicate'' (1998 film), a Bollywood film directed by Mahesh Bhatt * ''Duplicate'' (2009 film), a 2009 Malayalam film *''Duplicates'', a 1992 television film starring

Gregory Harrison Gregory Neale Harrison (born May 31, 1950) is an American actor. He is known primarily for his roles as Dr. George Alonzo "Gonzo" Gates, the young surgeon assistant of Dr. Trapper John McIntyre (played by Pernell Roberts) on the CBS series '' Tr ...

and

Kim Greist Kim Greist (born May 12, 1958) is a retired American actress and model. Her credits include '' C.H.U.D.'' (1984), ''Miami Vice'' (1985), ''Brazil'' (1985), '' Manhunter'' (1986), ''Throw Momma from the Train'' (1987), '' Punchline'' (1988), '' Hom ...

* ''

The Duplicate ''The Duplicate'', published in 1988, is a science fiction novel for young adults written by William Sleator. The novel explores themes of identity. Plot summary The main character, David, finds a device at the beach that can duplicate any ...

'', a 1988 children's book by William Sleater *

Batman Duplicate ''Batman: The Animated Series'' (often shortened as ''Batman TAS'' or ''BTAS'') is an American animated superhero television series based on the DC Comics superhero Batman. Developed by Bruce Timm and Eric Radomski, and produced by Warner Bros. ...

, a villain in ''Batman: The Animated Series'' * "

The Duplicate Man "The Duplicate Man" is an episode of the original ''The Outer Limits (1963 TV series), The Outer Limits'' television show. It was first aired on 19 December 1964, during the second season. Opening narration :''Since the first day that Man sta ...

", a 1964 episode of ''The Outer Limits'' * The duplicator machine in ''Calvin and Hobbes'' * "Duplicate", a song by White Town from '' Peek & Poke'' * "Duplicates", a song by We Are the Physics from '' We Are the Physics Are OK at Music''

Other uses

Duplicate publication Duplicate publication, multiple publication, redundant publication or self-plagiarism refers to publishing the same intellectual material more than once, by the author or publisher. It does not refer to the unauthorized republication by someone e ...

, the publication same intellectual material by the same author twice *

Reduplication In linguistics, reduplication is a Morphology (linguistics), morphological process in which the Root (linguistics), root or Stem (linguistics), stem of a word, part of that, or the whole word is repeated exactly or with a slight change. The cla ...

, a morphological process in linguistics *

Duplicate bridge Duplicate bridge is a variation of contract bridge where the same set of bridge deals (i.e., the distribution of the 52 cards among the four hands) are played by different competitors, and scoring is based on relative performance. In this way, ev ...

, a popular variant of contract bridge * Duplicate Scrabble, a Scrabble variant popular in French and some other languages * "Decouple, duplicate, discriminate," the "three Ds" articulated by

Madeleine Albright Madeleine Jana Korbel Albright (born Marie Jana Körbelová, later Korbelová; May 15, 1937 – March 23, 2022) was an American diplomat and political science, political scientist who served as the 64th United States Secretary of State, United S ...

as necessary for NATO to avoid * Duplicate, another term for

Body double In filmmaking, a double is a person who substitutes for another actor such that the person's face is not shown. There are various terms associated with a double based on the specific body part or ability they serve as a double for, such as stunt ...