Look up duplicate, duplication, duplications, duplicator, or twofold in Wiktionary, the free dictionary.

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

See also

• Clone, the process of producing similar populations of genetically identical individuals that occurs in nature when organisms such as bacteria, insects or plants reproduce asexually
• Copy (disambiguation)
• Doppelgänger, a paranormal double of a living person
• dup (disambiguation)
• dupe (disambiguation)
• Redundancy (disambiguation)
• Symmetry, has two meanings. The first is a vague sense of harmonious and beautiful proportion and balance. The second is an exact mathematical "patterned self-similarity" that can be demonstrated with the rules of a formal system, such as geometry or physics