- noun something added to something else to make it longer
- An enlargement in scope, or in length of time. For instance, a plug in which adds functionality to an application.
- A set of characters appearing at the end of a filename, indicating the file type. For example, in the filename notepen.exe, the .exe portion is the extension, and in this case specifies an executable program. Also called filename extension.
- A telephone, modem, or similar device connected to a main line, such as a PBX.
Not what you were looking for?