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We found 71 dictionaries with English definitions that include the word extension:
Click on the first link on a line below to go directly to a page where "extension" is defined.

General (28 matching dictionaries)

1. extension: Merriam-Webster.com [home, info]
2. extension: Oxford Learner's Dictionaries [home, info]
3. extension: American Heritage Dictionary of the English Language [home, info]
4. extension: Collins English Dictionary [home, info]
5. extension: Vocabulary.com [home, info]
6. extension: Macmillan Dictionary [home, info]
7. Extension, extension, eXtension: Wordnik [home, info]
8. extension: Cambridge Advanced Learner's Dictionary [home, info]
9. extension: Wiktionary [home, info]
10. extension: Webster's New World College Dictionary, 4th Ed. [home, info]
11. extension: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. extension: Infoplease Dictionary [home, info]
13. extension: Dictionary.com [home, info]
14. extension: UltraLingua English Dictionary [home, info]
15. extension: Cambridge Dictionary of American English [home, info]
16. Extension (George Braith album), Extension (Mac OS), Extension (anatomy), Extension (computing), Extension (geology), Extension (kinesiology), Extension (metaphysics), Extension (model theory), Extension (music), Extension (predicate logic), Extension (semantics), Extension (telephone), Extension: Wikipedia, the Free Encyclopedia [home, info]
17. Extension: Online Plain Text English Dictionary [home, info]
18. extension: Webster's Revised Unabridged, 1913 Edition [home, info]
19. extension: Rhymezone [home, info]
20. extension, extensin: AllWords.com Multi-Lingual Dictionary [home, info]
21. extension: Webster's 1828 Dictionary [home, info]
22. extension: Free Dictionary [home, info]
23. extension: Mnemonic Dictionary [home, info]
24. extension: WordNet 1.7 Vocabulary Helper [home, info]
25. extension: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. extension: Dictionary/thesaurus [home, info]

Art (9 matching dictionaries)

27. extension: Dictionary of Philosophical Terms and Names [home, info]
28. Extension: Ballet [home, info]
29. Extension: Glossary of Binary Graphics [home, info]
30. extension: The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) [home, info]
31. extension: Linguistic Glossary [home, info]
32. Extension: Lexicon of Linguistics [home, info]
33. Extension: Glossary of Stamp Collecting Terms [home, info]
34. extension: ODLIS: Online Dictionary of Library and Information Science [home, info]
35. Extension: Health & Beauty Glossary [home, info]

Business (10 matching dictionaries)

36. Extension: MoneyGlossary.com [home, info]
37. extension: Law.com Dictionary [home, info]
38. extension: Everybody's Legal Dictionary [home, info]
39. extension: INVESTORWORDS [home, info]
40. extension: Glossary of Legal Terms [home, info]
41. Extension: Bloomberg Financial Glossary [home, info]
42. EXTENSION: Bouvier's Law Dictionary 1856 Edition [home, info]
43. Extension: Securities Terminology [home, info]
44. Extension (geology), extension: Legal dictionary [home, info]
45. extension: Financial dictionary [home, info]

Computing (4 matching dictionaries)

46. extension: Free On-line Dictionary of Computing [home, info]
47. extension: Webopedia [home, info]
48. extension: I T Glossary [home, info]
49. Extension (Mac OS), Extension (Mozilla), Extension (computing), Extension (geology), Extension (kinesiology), extension: Encyclopedia [home, info]

Medicine (7 matching dictionaries)

50. Extension: MedTerms.com Medical Dictionary [home, info]
51. extension: online medical dictionary [home, info]
52. EXTENSION: Probert Encyclopaedia of Medicine [home, info]
53. Extension: Hepatitis C Information Central [home, info]
54. extension: Neurotrauma Glossary [home, info]
55. Extension (kinesiology), extension: Medical dictionary [home, info]
56. Extension: Drug Medical Dictionary [home, info]

Miscellaneous (2 matching dictionaries)

57. extension: A Brief Critical Dictionary of Education [home, info]
58. extension: Idioms [home, info]

Religion (1 matching dictionary)

59. Extension: Catholic Encyclopedia [home, info]

Science (3 matching dictionaries)

60. extension: Dictionary of Geology [home, info]
61. -extension, -extension, extension, extension, extension: PlanetMath Encyclopedia [home, info]
62. extension: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

63. extension: Urban Dictionary [home, info]

Sports (2 matching dictionaries)

64. Extension: Bicycle Glossary [home, info]
65. Extension: Sports Definitions [home, info]

Tech (4 matching dictionaries)

66. Extension: AUTOMOTIVE TERMS [home, info]
67. EXTENSION: Farrier & Hoofcare [home, info]
68. Extension: Beauty & Health Glossary [home, info]
69. Extension: Sweetwater Music [home, info]

(Note: See extensions for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (extension) ▸ noun:  act of expanding in scope; making more widely available ("Extension of the program to all in need") ▸ noun:  act of stretching or straightening out a flexed limb ▸ noun:  an educational opportunity provided by colleges and universities to people who not enrolled as regular students ▸ noun:  an additional telephone set that is connected to the same telephone line ▸ noun:  amount or degree or range to which something extends ("The wire has an extension of 50 feet") ▸ noun:  the ability to raise the working leg high in the air ("The dancer was praised for her uncanny 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 applications provide extensions for the files they create") ▸ noun:  a mutually agreed delay in the date set for the completion of a job or payment of a debt ("They applied for an extension of the loan") ▸ noun:  an addition to the length of something ▸ noun:  the spreading of something (a belief or practice) into new regions ▸ noun:  an addition that extends a main building ▸ noun:  the most direct or specific meaning of a word or expression; the class of objects that an expression refers to ("The extension of `satellite of Mars' is the set containing only Demos and Phobos") ▸ Also see extensions ▸ Words similar to extension ▸ Usage examples for extension ▸ Idioms related to extension (New!) ▸ Popular adjectives describing extension ▸ Words that often appear near extension ▸ Rhymes of extension ▸ Invented words related to extension