Definition of ISDN abbreviation from the Oxford Advanced American Dictionary

 

ISDN

 abbreviation
abbreviation
NAmE//ˌaɪ ɛs di ˈɛn//
 
 
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integrated services digital network(a system for carrying sound signals, images, etc. along wires at high speed) an ISDN Internet connection
See the Oxford Advanced Learner's Dictionary entry: ISDN