Definitions

1. noun

relating to or forming a highway connecting two or more states in the United States

“The interstate highway system was a major project of the 1950s.”

2. adjective

relating to or characteristic of a state or states in the United States

“Interstate trade agreements have helped boost economic growth in the region.”

3. adverb

in or to a different state, especially in the United States

“He drove interstate to visit his relatives in another state.”