Usually means: Increase or expansion in scope.
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We found 68 dictionaries that define the word extension:

General (24 matching dictionaries)
  1. extension: Merriam-Webster.com
  2. extension: Oxford Learner's Dictionaries
  3. extension: American Heritage Dictionary of the English Language
  4. extension: Collins English Dictionary
  5. extension: Vocabulary.com
  6. Extension, extension, eXtension: Wordnik
  7. extension: Cambridge Advanced Learner's Dictionary
  8. extension: Wiktionary
  9. extension: Webster's New World College Dictionary, 4th Ed.
  10. extension: The Wordsmyth English Dictionary-Thesaurus
  11. extension: Infoplease Dictionary
  12. extension: Dictionary.com
  13. extension: Cambridge Essential American English Dictionary
  14. 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
  15. Extension: Online Plain Text English Dictionary
  16. extension: Webster's Revised Unabridged, 1913 Edition
  17. extension: Rhymezone
  18. extension, extensin: AllWords.com Multi-Lingual Dictionary
  19. extension: Webster's 1828 Dictionary
  20. extension: Free Dictionary
  21. extension: Mnemonic Dictionary
  22. extension: Dictionary/thesaurus

Art (9 matching dictionaries)
  1. extension: Dictionary of Philosophical Terms and Names
  2. Extension: Ballet
  3. Extension: Glossary of Binary Graphics
  4. The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) (No longer online)
  5. Linguistic Glossary (No longer online)
  6. Extension: Lexicon of Linguistics
  7. Glossary of Stamp Collecting Terms (No longer online)
  8. ODLIS: Online Dictionary of Library and Information Science (No longer online)
  9. Extension: Health & Beauty Glossary

Business (10 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. extension: Law.com Dictionary
  3. Everybody's Legal Dictionary (No longer online)
  4. INVESTORWORDS (No longer online)
  5. Glossary of Legal Terms (No longer online)
  6. Extension: Bloomberg Financial Glossary
  7. Bouvier's Law Dictionary 1856 Edition (No longer online)
  8. Extension: Securities Terminology
  9. Extension (geology), extension: Legal dictionary
  10. extension: Financial dictionary

Computing (4 matching dictionaries)
  1. extension: Free On-line Dictionary of Computing
  2. Webopedia (No longer online)
  3. I T Glossary (No longer online)
  4. Extension (Mac OS), Extension (Mozilla), Extension (computing), Extension (geology), Extension (kinesiology), extension: Encyclopedia

Medicine (8 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Extension: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. Probert Encyclopaedia of Medicine (No longer online)
  5. Hepatitis C Information Central (No longer online)
  6. Neurotrauma Glossary (No longer online)
  7. Extension (kinesiology), extension: Medical dictionary
  8. Extension: Drug Medical Dictionary

Miscellaneous (2 matching dictionaries)
  1. A Brief Critical Dictionary of Education (No longer online)
  2. extension: Idioms

Religion (1 matching dictionary)
  1. Extension: Catholic Encyclopedia

Science (3 matching dictionaries)
  1. extension: Dictionary of Geology
  2. -extension, -extension, extension, extension, extension: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. extension: Urban Dictionary

Sports (2 matching dictionaries)
  1. Extension: Bicycle Glossary
  2. Extension: Sports Definitions

Tech (4 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Farrier & Hoofcare (No longer online)
  3. Extension: Beauty & Health Glossary
  4. Sweetwater Music (No longer online)

(Note: See extensions as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The act of extending; a stretching out; enlargement in length, breadth, or time; an increase.
noun:  The state of being extended.
noun:  That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension").
noun:  A part of a building that has been added onto the original.
noun:  An outgrowth; a part of something that extends its capabilities.
noun:  (semantics) Capacity of a concept or general term to include a greater or smaller number of objects; — correlative of intension.
noun:  (linguistics, semantics) semantic widening, broadening of meaning
noun:  (banking, finance) A written engagement on the part of a creditor, allowing a debtor further time to pay a debt.
noun:  (medicine) The operation of stretching a broken bone so as to bring the fragments into the same straight line.
noun:  (weightlifting) An exercise in which an arm or leg is straightened against resistance.
noun:  (fencing) A simple offensive action, consisting of extending the weapon arm forward.
noun:  (telecommunications) A numerical code used to indicate a specific telephone in a telecommunication network.
noun:  (computing) An optional software component that adds functionality to an application.
noun:  (logic) The set of tuples of values that, used as arguments, satisfy the predicate.
noun:  (grammar) A kind of derivative morpheme applied to verbs in Bantu languages.
noun:  (ring theory, of an ideal in the domain of a ring homomorphism) The ideal in the codomain generated by the image of the given ideal under the given homomorphism.
noun:  (education) University programs that are targeted at the broader (usually adults) community whose participants are not full-time enrolled students.
noun:  (computing) Ellipsis of file extension. [A short series of text characters at the end of a computer filename, used to indicate the type of contents and the software that will be required to operate or open it.]

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