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• In semantics (with applications to both philosophy and mathematics), extension is the set of things to which a property applies; see Extension (semantics).
• In mathematics, an extension of some structure is another structure which contains the original structure.
  • For the extension of a group or algebra, see extension (algebra).
  • For the extension of a field, see field extension.
  • For the extension of a bounded linear operator, see continuous linear extensionFunctional analysis In functional analysis, it is often convenient to define something on a normed vector space by defining it on a dense set and extending it to the whole space. This procedure is justified for bounded linear operators by the theorem belo.
• Extension (geology)
• In computing:
  • For the programming concept, see extension (computing)This page talks about the programming concept; for other meanings, see extension. In computing, an extension is a programming concept involving elements that have been added into a programming language or a computer program. Sometimes, the term refers to
  • For the last part of a filename, see filename extensionA filename extension or filename suffix is an extra set of (usually) alphanumeric characters that is appended to the end of a filename to allow computer users (as well as various pieces of software on the computer system) to quickly determine the type of.
• Agricultural extension is the application of scientific research and new knowledge to agricultural practices through farmer education.
• ElectricityElectricity is a property of certain subatomic particles, such as electrons and protons, that gives rise to attractive and repulsive forces between them. It is one of the four fundamental forces of nature, and is a conserved property of matter that can be: extension cord.
• ElectronicsElectronics is the study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The pure study of such devices is considered as a bra: extension cable.