in·ter·state /ˌɪntɚ/
  (a.)州際的
  In·ter·state a. Pertaining to the mutual relations of States; existing between, or including, different States; as, interstate commerce.
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  interstate
       adj : involving and relating to the mutual relations of states
             especially of the US; "Interstate Highway Commission";
             "interstate highways"; "Interstate Commerce
             Commission"; "interstate commerce" [ant: intrastate]