Extension may refer to:

• Extension (kinesiology), a movement of a joint in which one part of the body is moved away from another. Extension is a movement of a joint that results in increased angle between two bones or body surfaces at a joint The movement of body structures is accomplished by the contraction of Muscles Muscles may move parts of the skeleton relatively to each other or may move parts of internal organs relatively
• Extension (metaphysics), the property of taking up space
• Extension (semantics), the set of things to which a property applied
• Extension (mathematics); an extension of some structure is another structure which contains the original structure
• Extension (geology)
• Extension (telephone), an internal telephone line attached to a PBX or Centrex system
• Software extension, a computer program that is not useful in its own right but designed to be incorporated in another piece of software
  • System Extension, a particular type of this software on the classic Mac OS
  • Extension, a type of add-on for Firefox and other Mozilla projects
• Filename extension, a suffix to the name of a computer file applied to show its format
• Tension (physics)
• Extension (community development), the building of community capacity by outsiders, for instance, agricultural extension
• Extension (cheerleading), a stunt in which a flyer is held in the air by the bases' fully extended arms
• Extension, the classical name for the Mc1r gene. In Metaphysics, extension is roughly speaking the property of "taking up space" In any of several studies that treat the use of signs for example in Linguistics, Logic, Mathematics, Semantics, and Semiotics, the In Geology, a rift is a place where the Earth 's crust and Lithosphere are being pulled apart and is an example of Extensional tectonics An extension telephone is an additional Telephone wired to the same Telephone line as another A software extension is a Computer program designed to be incorporated into another piece of Software in order to enhance or extend, the functionalities On the Apple Macintosh operating system prior to Mac OS X, extensions were small pieces of code that extended the system's functionality Mac OS is the trademarked name for a series of Graphical user interface -based Operating systems developed by Apple Inc Add-ons are installable enhancements to the Mozilla Foundation 's projects (and compatible variants such as Portable Firefox) The Mozilla Foundation is a Non-profit organization that exists to support and provide leadership for the Open source Mozilla project A filename extension is a suffix to the name of a Computer file applied to indicate the encoding convention ( File format) of its contents In Physics String Tension is the magnitude of the pulling force exerted by a string cable chain or similar object on another object Agricultural extension was once known as the application of scientific research and new knowledge to agricultural practices through farmer education The melanocortin 1 receptor (also known as melanocyte-stimulating hormone receptor or Mc1r) is one of the key Proteins in regulating hair and skin color
• Extension (music), a set of notes that fit outside the standard range
• Extension, BC is a small former coal-mining village near Nanaimo, BC, Canada
• Enamel extension in dentistry
• Extension cable
• Extensive property, in physics, a property which depends on the system size or the amount of material in the system
• Extension school, a school for continuing education
• Hair extensions, strands of hair added to supplement a person's existing hair
• Eyelash extensions
• Extensions the 1979 album by The Manhattan Transfer
• Extension of universal health care. In music an extension is a set of musical notes that lie outside the standard range Dentistry' is the "evaluation diagnosis prevention and/or treatment (nonsurgical surgical or related procedures of diseases disorders and/or conditions of the oral cavity An extension cord, power extender, or extension lead is a length of flexible electrical Power cable (flex with a plug on one end and one or In the Physical sciences an intensive property (also called a bulk property) is a Physical property of a system that does not depend on the Continuing education is an all encompassing term within a broad spectrum of post-secondary learning activities and programs Continuing education is an all encompassing term within a broad spectrum of post-secondary learning activities and programs Artificial hair integrations add length to Human hair. Types of hair fibers Hair extensions are made from a range of human and synthetic fibers Like Hair extensions, eyelash extensions are a Cosmetic process whereby synthetic single fiber polyester thread like materials are applied to create a fuller Extensions was released by The Manhattan Transfer on October 31, 1979 on the Atlantic Records label The Manhattan Transfer is the name of two incarnations of an American vocal group with Tim Hauser being the only link between the two groups Universal health care is health care coverage which is extended to all eligible residents of a governmental region

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