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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
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



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 fields
A movement which has the effect of straightening a limb.


A wing or structure added to an existing building.


(filename extension)


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


(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 ?
The program extension also serves to creation line diagram maps.
Matt Gannon, assistant vice president of federal affairs for the National Association of Mutual Insurance Companies, discussing the upcoming "Flood the Hill" effort, which involves 13 trade groups across multiple industries that will push for Senate passage of a National Flood Insurance Program extension starting May 7:
Kepler Mission for NASA will continue its mission following a program extension through 2016.
Application Developer Program Extension of Tendril Connect Platform Partner Program
Industry leaders comment on topics ranging from a National Flood Insurance Program extension, to the consequences of soft-market pricing, and more.
Only 18 days remain until the current program extension expires on March 31st.
WASHINGTON--A Republican member of the House Ways and Means Committee implored the Senate to act on passage of a five-year National Flood Insurance Program extension that includes reforms to the program.
Industry leaders comment on topics ranging from a series of tornadoes that struck the Dallas-Fort Worth area, to the Financial Stability Oversight Council approving its final rule on systemically significant non-bank financial institutions, to the familiar story of lack of action on a long-term National Flood Insurance Program extension.
The Detroit 874 is a unique adaptation of Dickies' classic 874 work pant and represents a program extension of the recently launched "874[R] Versus" integrated marketing campaign.
Senate approved the National Flood Insurance Program Extension Act of 2010 (H.
The VIP program extension for 2010 was announced at a business session in Vancouver for EMC's top channel performers from around the world.

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