interstateTranslate interstate | into French | into Italian Definition of interstate adjective Pronunciation: /ɪntəˈsteɪt/ existing or carried on between states, especially of the US:interstate travel US in a different state from one referred to or understood:their interstate rivals noun Pronunciation: /ˈɪntəsteɪt/ (also interstate highway) one of a system of motorways running between US states: a picnic area just off the interstate adverb Pronunciation: /ɪntəˈsteɪt/ Australian from one state to another: House for sale. Owner moving interstateinterstate in other Oxford dictionaries Definition of interstate in the US English dictionary