Extension

In metaphysics, extension is the property of taking up space; see Extension (metaphysics).
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 extension.
In physiology, extension is one of the movements of a joint such as the knee.
Extension (geology)
Extension (telephone)
In computing:
- For the programming concept, see extension (computing)
- For the last part of a filename, see filename extension.
Agricultural extension is the application of scientific research and new knowledge to agricultural practices through farmer education.
Electricity: Extension cable.
Electronics: extension cable.