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) Apple enhancements starting with 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 ?
"She had her phone plugged into the extension cord and it was by the bathtub, and I did it, she did it, we all had sat there in the bathtub with our phones plugged in and played our games," the girl's stepmother, told CNN at the time.
MSHA issued two violations of [section]56.12028 for failing to test and record the resistance of extension cords used as part of the grounding system.
But she also said residents should be aware that the program is for lights and extension cords only and not for Christmas trees or wreaths.
FITCHBURG - An overloaded extension cord was the cause of a blaze on Daniels Street Tuesday morning that displaced 24 people, including a woman severely injured when she jumped from her third-floor apartment to escape the blaze.
"This partnership with Lights for Life was a green way to recycle the lights and extension cords, and it significantly helps a family dealing with cancer."
If you are using extension cords, ensure that they, as well as all ornaments, are rated for outdoor use.
You need to extend your reach, so it makes sense to stock a few extension cords in a variety of lengths.
Extension cords let you go to great lengths for spring maintenance chores in and around the home.
Extension cords are handy items to have around, but they can become a safety risk if damaged or poorly maintained.
Ideal for the construction industry, retractile extension cords are designed with a glow-in-the-dark material that makes working in dark areas safer.
Inside the enclosure is a 110 VAC receptacle so installers and technicians don't have to find outlets or extension cords. Safety features for the Class II Power Supply include short-circuit protection, low-battery monitor output relay, autosensing AC input, fire/life safety emergency release, and ground-fault detection.