Definition of ISDN abbreviation from the Oxford Advanced Learner's Dictionary

 

ISDN

 abbreviation
abbreviation
BrE BrE//ˌaɪ es diː ˈen//
 
; NAmE NAmE//ˌaɪ es diː ˈen//
 
 
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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 American Dictionary entry: ISDN