Usually means: Integrated Services Digital Network technology.
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We found 48 dictionaries that define the word ISDN:

General (16 matching dictionaries)
  1. ISDN: Merriam-Webster
  2. ISDN: Oxford Learner's Dictionaries
  3. ISDN: American Heritage Dictionary of the English Language
  4. ISDN: Collins English Dictionary
  5. isdn: Wordnik
  6. ISDN, isdn: Cambridge Advanced Learner's Dictionary
  7. ISDN: Wiktionary
  8. ISDN: Webster's New World College Dictionary, 4th Ed.
  9. ISDN: Dictionary.com
  10. ISDN (album), ISDN (disambiguation), ISDN, Isdn: Wikipedia, the Free Encyclopedia
  11. ISDN: Stammtisch Beau Fleuve Acronyms
  12. ISDN: TheFreeDictionary.com
  13. isdn: Longman Dictionary of Contemporary English
  14. ISDN: Merriam-Webster

Business (2 matching dictionaries)
  1. Travel Industry Dictionary (No longer online)
  2. Glossary of Trade and Shipping Terms (No longer online)

Computing (18 matching dictionaries)
  1. ISDN: Free On-line Dictionary of Computing
  2. ISDN: Netlingo
  3. ISDN: CCI Computer
  4. Technology Terms and Acronyms (No longer online)
  5. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  6. CNET Internet Glossary (No longer online)
  7. ISDN: Computer Telephony & Electronics Dictionary and Glossary
  8. Glossary of Internet Terms (No longer online)
  9. ISDN: Tech Terms Computer Dictionary
  10. ISDN: ILC Internet Terms
  11. Videoconfererencing Glossary (No longer online)
  12. Internet Terms (No longer online)
  13. Internet Terms (No longer online)
  14. Karbo's Dictionary (No longer online)
  15. Webopedia (No longer online)
  16. Data Formats and Their Sugggested File Extensions (No longer online)
  17. I T Glossary (No longer online)
  18. ISDN: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. ISDN: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. ISDN: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. I.S.D.N. (to be i.s.d.end), ISDN: Urban Dictionary

Tech (7 matching dictionaries)
  1. ISDN: Webster's New World Telecom Dictionary
  2. ISDN: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  3. Energy Terms (No longer online)
  4. Glossary of video terms (No longer online)
  5. Rane Professional Audio Reference (No longer online)
  6. Sweetwater Music (No longer online)
  7. ISDN: Web Hosting Glossary

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (organic chemistry) Initialism of isosorbide dinitrate. [(pharmacology) A coronary vasodilator C₆H₈N₂O₈ (trademark Isordil) used especially in the treatment of angina pectoris.]
noun:  (telecommunications) Initialism of integrated services digital network. [The integration of data and voice communications services that are transported over digital facilities of various physical types.]

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