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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 dictionaries 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 dictionaries Art (9 matching dictionaries)
  1. extension: Dictionary of Philosophical Terms and Names [home, info]
  2. Extension: Ballet [home, info]
  3. Extension: Glossary of Binary Graphics [home, info]
  4. extension: The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) [home, info]
  5. extension: Linguistic Glossary [home, info]
  6. Extension: Lexicon of Linguistics [home, info]
  7. Extension: Glossary of Stamp Collecting Terms [home, info]
  8. extension: ODLIS: Online Dictionary of Library and Information Science [home, info]
  9. Extension: Health & Beauty Glossary [home, info]

Business dictionaries Business (10 matching dictionaries)
  1. Extension: MoneyGlossary.com [home, info]
  2. extension: Law.com Dictionary [home, info]
  3. extension: Everybody's Legal Dictionary [home, info]
  4. extension: INVESTORWORDS [home, info]
  5. extension: Glossary of Legal Terms [home, info]
  6. Extension: Bloomberg Financial Glossary [home, info]
  7. EXTENSION: Bouvier's Law Dictionary 1856 Edition [home, info]
  8. Extension: Securities Terminology [home, info]
  9. Extension (geology), extension: Legal dictionary [home, info]
  10. extension: Financial dictionary [home, info]

Computing dictionaries Computing (4 matching dictionaries)
  1. extension: Free On-line Dictionary of Computing [home, info]
  2. extension: Webopedia [home, info]
  3. extension: I T Glossary [home, info]
  4. Extension (Mac OS), Extension (Mozilla), Extension (computing), Extension (geology), Extension (kinesiology), extension: Encyclopedia [home, info]

Medicine dictionaries Medicine (7 matching dictionaries)
  1. Extension: MedTerms.com Medical Dictionary [home, info]
  2. extension: online medical dictionary [home, info]
  3. EXTENSION: Probert Encyclopaedia of Medicine [home, info]
  4. Extension: Hepatitis C Information Central [home, info]
  5. extension: Neurotrauma Glossary [home, info]
  6. Extension (kinesiology), extension: Medical dictionary [home, info]
  7. Extension: Drug Medical Dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (2 matching dictionaries)
  1. extension: A Brief Critical Dictionary of Education [home, info]
  2. extension: Idioms [home, info]

Religion dictionaries Religion (1 matching dictionary)
  1. Extension: Catholic Encyclopedia [home, info]

Science dictionaries Science (3 matching dictionaries)
  1. extension: Dictionary of Geology [home, info]
  2. -extension, -extension, extension, extension, extension: PlanetMath Encyclopedia [home, info]
  3. extension: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. extension: Urban Dictionary [home, info]

Sports dictionaries Sports (2 matching dictionaries)
  1. Extension: Bicycle Glossary [home, info]
  2. Extension: Sports Definitions [home, info]

Tech dictionaries Tech (4 matching dictionaries)
  1. Extension: AUTOMOTIVE TERMS [home, info]
  2. EXTENSION: Farrier & Hoofcare [home, info]
  3. Extension: Beauty & Health Glossary [home, info]
  4. Extension: Sweetwater Music [home, info]

(Note: See extensions for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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

Phrases that include extension:   extension ladder, extension service, brand extension, file name extension, algebraic extension, more...

Words similar to extension:   annex, annexe, denotation, elongation, lengthiness, prolongation, propagation, reference, wing, arm, ell, extension service, limb, university extension, more...

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