Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

ISDN

abbreviation

Definition of ISDN

  1. integrated services digital network




Learn More about isdn


Seen and Heard

What made you want to look up ISDN? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

expressing little or no emotion

Get Word of the Day daily email!