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We found 14 dictionaries with English definitions that include the word filename extension:
Click on the first link on a line below to go directly to a page where "filename extension" is defined.

General (9 matching dictionaries)

1. filename extension: Vocabulary.com [home, info]
2. filename extension: Wiktionary [home, info]
3. filename extension: Dictionary.com [home, info]
4. Filename extension: Wikipedia, the Free Encyclopedia [home, info]
5. filename extension: Rhymezone [home, info]
6. filename extension: Free Dictionary [home, info]
7. filename extension: Mnemonic Dictionary [home, info]
8. filename extension: LookWAYup Translating Dictionary/Thesaurus [home, info]
9. filename extension: Dictionary/thesaurus [home, info]

Computing (3 matching dictionaries)

10. filename extension: Free On-line Dictionary of Computing [home, info]
11. Filename Extension, filename extension: CCI Computer [home, info]
12. filename extension: Encyclopedia [home, info]

Medicine (1 matching dictionary)

13. filename extension: online medical dictionary [home, info]

Tech (1 matching dictionary)

14. Filename extension: Web Hosting Glossary [home, info]

(Note: See filename_extensions for more definitions.)

Quick definitions from WordNet (filename extension) ▸ noun:  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 BASIC files use the filename extension .BAS") ▸ Also see filename_extensions ▸ Words similar to filename extension ▸ Usage examples for filename extension ▸ Idioms related to filename extension (New!) ▸ Words that often appear near filename extension ▸ Rhymes of filename extension ▸ Invented words related to filename extension