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Definitions of Filename extension:

Commonly a three or four-letter extension on the end of a file name designating the file type. There are hundreds in existence, and new ones frequently being invented. Examples are: .txt (text file), .gif (Graphics Interchange Format).
www.devel.legend.co.uk/resources/gloss.html
Represents the file's format and tells your computer what application to use to open it. Examples: .doc, .html, .gif, .xls, .mov, .zip. Top
edtech.tennessee.edu/~set19/html/terminology.htm
Three letters that follow a period after the filename; the extension identifies the file type, for example, the extension .doc identifies a file created using word.
www.stedwards.edu/it_dept/competency/module4/lesson1/wpdefinitions1.htm
Usually a three-letter extension (sometimes it is two or four letters) attached to a file name indicating its type. Just about everywhere software product has its own file type: .doc is a Microsoft Word document, .js is a JavaScript file, .dos is DOS text information, .pcl is a Hewlett Packard control language file etc etc. Two common examples which can be used by a variety of programs are: .txt for text files, .gif for a Graphics Interchange Format file.
www.coredon.clara.net/internet_glossary-a_f.htm
Two, three, or four characters at the end of a filename to indicate to computers without file typing what kind of file it is. For example, a filename ending in .sit indicates a StuffIt binary; a filename ending in .html indicates a file in HTML, or Hypertext Markup Language.
literacynet.org/modules/netglossary.html
extension: a string of characters beginning with a period and followed by one to three letters; the optional second part of a PC computer filename; "most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"
wordnet.princeton.edu/perl/webwn
A filename extension or filename suffix is an extra set of (usually) alphanumeric characters that is appended to the end of a filename to allow computer users (as well as various pieces of software on the computer system) to quickly determine the type of data stored in the file. It is one of several popular methods for distinguishing between file formats.
en.wikipedia.org/wiki/Filename_extension

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