noun
- A string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename.
- usage: "most applications provide extensions for the files they create"; "most BASIC files use the filename extension. BAS"
- synonyms: extension, file name extension
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). filename extension. Retrieved September 21, 2026, from http://smartdefine.org/filename_extension/definitions/1276167 |
| Chicago | WordNet. 2010. "filename extension" http://smartdefine.org/filename_extension/definitions/1276167 (accessed September 21, 2026). |
| Harvard | WordNet 2010, filename extension, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/filename_extension/definitions/1276167>. |
| MLA | WordNet. "filename extension" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/filename_extension/definitions/1276167> |