# Contraction

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> Source: https://en.wikipedia.org/wiki/Contraction
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{{wiktionary|contraction|contracted}}
'''Contraction''' may refer to:
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== Linguistics ==
* [Contraction (grammar)](/source/Contraction_(grammar)), a shortened word
* [Poetic contraction](/source/Poetic_contraction), omission of letters for poetic reasons
* [Elision](/source/Elision), omission of sounds
** [Syncope (phonology)](/source/Syncope_(phonology)), omission of sounds in a word
* [Synalepha](/source/Synalepha), merged syllables
** [Synaeresis](/source/Synaeresis), combined vowels
** [Crasis](/source/Crasis), merged vowels or diphthongs

== Mathematics and logic ==
* [Contraction (operator theory)](/source/Contraction_(operator_theory)), in operator theory, state of a bounded operator between normed vector spaces after suitable scaling
* [Contraction hierarchies](/source/Contraction_hierarchies), in applied mathematics, a technique to speed up shortest-path routing
* [Contraction mapping](/source/Contraction_mapping), a type of function on a metric space
* [Edge contraction](/source/Edge_contraction) or vertex contraction, graph operations used in graph theory
* [Tensor contraction](/source/Tensor_contraction), an operation on one or more tensors that arises from the natural pairing of a finite-dimensional vector space and its dual
* [Interior product](/source/Interior_product), a tensor contraction specifically of a differential form with a vector field
* [Left contraction and right contraction](/source/Geometric_algebra) of multivectors in a geometric algebra, extensions of the inner product
* One of the rules of [conditional independence](/source/Conditional_independence), in probability
* [Contraction (logic)](/source/Contraction_(logic)), a structural rule in proof theory

== Medicine ==
*[Muscle contraction](/source/Muscle_contraction), the physiological condition of a muscle which generates tension (traction) at its origin and insertion
** [Uterine contraction](/source/Uterine_contraction), contraction of the uterus, such as during childbirth
*[Contractility](/source/Contractility), the intrinsic ability of the heart/myocardium to contract
* [Wound contraction](/source/Wound_contraction), a stage in wound healing

== Other uses ==
* [Contraction (economics)](/source/Contraction_(economics)), a general slowdown in economic activity; the opposite of economic expansion
* [Contraction (physics)](/source/Contraction_(physics)), change in the volume of matter in response to a change in temperature
* [Lanthanide contraction](/source/Lanthanide_contraction), the decrease in size of the ionic radius of lanthanide elements with their growing atomic number
* [''Contracted'' (film)](/source/Contracted_(film)), a 2013 horror thriller film by Eric England and its sequel ''[Contracted: Phase II](/source/Contracted%3A_Phase_II)'' (2015) which directed by Josh Forbes

== See also ==
* [Contract (disambiguation)](/source/Contract_(disambiguation))
* [Contraction principle (disambiguation)](/source/Contraction_principle_(disambiguation))

{{disambiguation}}

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Adapted from the Wikipedia article [Contraction](https://en.wikipedia.org/wiki/Contraction) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Contraction?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.