Duplication

Duplication, duplicate, and duplicator may refer to:

Biology and genetics

 * Gene duplication, a process which can result in free mutation
 * Chromosomal duplication, which can cause Bloom and Rett syndrome
 * Polyploidy, 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, a medical condition also known as penile duplication

Computing

 * Duplicate code, a source code sequence that occurs more than once in a program
 * Duplicate characters in Unicode, 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)
 * Content copying through cut, copy, and paste
 * File copying

Mathematics

 * Duplication, or doubling, multiplication by 2
 * Duplication matrix, a linear transformation dealing with half-vectorization
 * Doubling the cube, a problem in geometry also known as duplication of the cube
 * A type of multiplication theorem called the Legendre duplication formula or simply "duplication formula"

Technology

 * Duplicating machines, machines and processes designed to reproduce printed material, photocopying being among the best-known today; see also List of duplicating processes
 * Loop bin duplicator, a device designed to copy pre-recorded audio tapes
 * Double track, a method of railway design also known as track duplication
 * In road construction, 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 and Kim Greist
 * The Duplicate, a 1988 children's book by William Sleater
 * Batman Duplicate, a villain in Batman: The Animated Series
 * "The Duplicate Man", 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, the publication same intellectual material by the same author twice
 * Reduplication, a morphological process in linguistics
 * Duplicate bridge, 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 as necessary for NATO to avoid
 * Duplicate, another term for Body double in films