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extension

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia, Hutchinson 0.04 sec.

(1) See domain extension.

(2) A program module that adds functionality to an application or system program. For example, program modules that add capabilities to the Firefox browser are actually called "extensions" (see Firefox extension). The same type of add-on module in the Photoshop image editor is called a "plug-in" (see Photoshop plug-in).

Executable modules that enhance the Mac operating system are called "extensions," while enhancements to the Windows OS are called "dynamic link libraries" (see DLL).

(2) A file type that is appended to the end of a file name. All programs and almost all data files use extensions, which are separated from the file name with a dot. For example, LETTER.DOC is a Word document. NOTEPAD.EXE is a text editor program in Windows, while TEXTEDIT.APP is a text editor in the Mac.

In Windows versions, prior to Windows 95, an extension could only have a maximum of three letters or digits. Starting with Windows 95, Windows files can have extensions with more characters.

Exhaustive Lists
There are Web sites that catalog as many file extensions as possible such as www.filext.com.

Popular Extensions
A list of popular extensions follows by letter. For example, to find out what an .SWF file is, look up SWF under "extension S. See Win Show file extensions, dangerous extensions and graphics formats. See also domain extension.

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


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? Mentioned in ? References in classic literature
 
In the drama, the episodes are short, but it is these that give extension to Epic poetry.
The Poetics of Aristotle by Aristotle View in context
After making the greatest opposition between thought and extension, Descartes, like Plato, supposes them to be reunited for a time, not in their own nature but by a special divine act (compare Phaedrus), and he also supposes all the parts of the human body to meet in the pineal gland, that alone affording a principle of unity in the material frame of man.
Meno by Plato View in context
Merchant ships are but extension bridges; armed ones but floating forts; even pirates and privateers, though following the sea as highwaymen the road, they but plunder other ships, other fragments of the land like themselves, without seeking to draw their living from the bottomless deep itself.
Moby Dick I-LXVII by Melville, Herman View in context
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