extension

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extension

1. Commerce a delay, esp one agreed by all parties, in the date originally set for payment of a debt or completion of a contract
2. the property of matter by which it occupies space; size
3. Med a steady pull applied to a fractured or dislocated arm or leg to restore it to its normal position
4. 
a. a service by which some of the facilities of an educational establishment, library, etc., are offered to outsiders
b. (as modifier): a university extension course
5. Logic
a. the class of entities to which a given word correctly applies: thus, the extension of satellite of Mars is the set containing only Deimos and Phobos
b. conservative extension a formal theory that includes among its theorems all the theorems of a given theory

Extension

 

in metalworking. (1) Hot deformation, in which the length of a billet is increased by decreasing the area of its cross section. Extension is performed on hammers and presses by successive pressings of the billet, with a rotation of 90° after each pressing.

(2) Cold sheet pressing, in which hollow components are made from sheets. Cold extension is used to make bushings, casings for instruments and apparatus, and cans and saucepans. The billet is usually cut from a sheet, with an allowance for diameter, and is pressed into the peripheral area of the matrix. Upon the subsequent movement of the puncheon, the middle, unpressed part of the billet is pressed into the opening in the matrix.

extension

[ik′sten·chən]
(mathematics)
extension fields
(physiology)
A movement which has the effect of straightening a limb.

extension

A wing or structure added to an existing building.

extension

(filename extension)

extension

(programming)
A feature or piece of code which extends a program's functionality, e.g. a plug-in.

extension

(1) See domain extension.

(2) A software add-on. For example, extensions add functionality to Firefox and Chrome Web browsers.

(3) Prior to Mac OS X, an executable module that enhanced the Mac operating system. The Windows counterpart is a "dynamic link library" (see DLL).

(4) Enhancements to Apple's iOS 8 and OS X Version 10.10 that enable apps to share functions in other apps. See "iOS 8" in iOS versions.

(5) A file type that is appended to the end of a file name. All executable programs in the Windows and Mac worlds use extensions: .EXE in Windows; .APP in Mac (see APP file). In the Unix/Linux environment, "executables" do not use an extension, but no matter which environment, "data" files have extensions. For example, a file with a .DOC or .DOCX extension is a Microsoft Word document. A file with a .JPG extension is a JPEG image.

Prior to Windows 95, extensions were limited to three characters. Starting with Windows 95, they can be very large (254-260 characters depending on Windows version); however, they are kept small in practice.

Common Extensions and Exhaustive Lists
In this encyclopedia, more than 500 common file extensions are listed under the terms "extension," followed by their first letter such as extension a, extension b and extension c. However, there are websites that catalog many more, including the most obscure; for example, visit www.filext.com. See Win Show file extensions, dangerous extensions and graphics formats. See also domain extension.
References in periodicals archive ?
0 extension cables to its existing lineup of USB cabling products.
We strongly advise people to regularly test electrical appliances - make sure they are in good working order and use manufacturers or fully tested extension cables, and remove multi- block plugs and replace with the safe and correct strip plugs.
Like an episode of You've Been Framed sponsored by The Accident Group, each one shows a freeze-framed image of an horrific mishap unfolding The builder about to besquashed by a girder as he stumbles over a drill The office worker about to brain himself on a filing cabinet as he trips over an extension cable Or - the piece de resistance a chef plunging her hand into the deep fat fryer after slipping on spilt milk.
According to the company, is also an ideal iPodshuffle companion as it can connect digital music players to any USB port including iMac G3, eMac and Apple Studio Display without an extension cable or dock.
The selected pressure sensor can also be used remotely in conjunction with the supplied extension cable.
A couple had a lucky escape after an overheated extension cable is believed to have sparked a fire at their home.
It's thought that 14-year-old Jennifer Hild plugged the stereo into an extension cable and perched it on a window- sill.
Initial reports blame an electrical fault, with an extension cable thought to be the cause.
Rubber insulation on an extension cable powering a light in the loft had worn to expose a live wire.
When police came to do a drugs raid on the property they discovered the extension cable and Knutton was brought in for questioning.
Lindsay Parkes and her sons Ryan and Jordan raced out of their house as an overheated extension cable drum sparked a fire which left their home in tatters yesterday.
According to the company, RedRover enables users to control audio software whilst 10ft away from their computer, or further with an optional USB hub or extension cable.