Definition of superhighway noun from the Oxford Advanced Learner's Dictionary

 

superhighway

 noun
noun
BrE BrE//ˌsuːpəˈhaɪweɪ//
 
, BrE//ˌsjuːpəˈhaɪweɪ//
 
; NAmE NAmE//ˌsuːpərˈhaɪweɪ//
 
 
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(North American English, old-fashioned) = interstate
See the Oxford Advanced American Dictionary entry: superhighway

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