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superhighway

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superhighway/ˌsuːpɚˈhaɪˌweɪ/noun
pluralsuperhighways
superhighway
/ˌsuːpɚˈhaɪˌweɪ/
noun
pluralsuperhighways
Learner's definition of SUPERHIGHWAY  
[count]US
: a large and wide highway used for traveling at high speeds over long distances
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