Definition of interstate noun from the Oxford Advanced American Dictionary

 

interstate

 noun
noun
NAmE//ˈɪntərˌsteɪt//
 
(also interstate highway)
 
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a wide road, with at least two lanes in each direction, where traffic can travel fast for long distances across many states. You can only enter and leave interstates on special ramps.
See the Oxford Advanced Learner's Dictionary entry: interstate

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