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interstate as in: interstate commerce
relating to the mutual relations between states — especially of the United States
Note that interstate is often contrasted with intrastate. An intrastate highway is used to move from one location in a state to another, rather than to move between states. Similarly, interstate commerce is business between states; whereas intrastate commerce affects a state without affecting other states. Under the U.S. Constitution, the interstate/intrastate distinction is important when determining when the federal government has authority to override state government.
