"interstate" in the noun sense
1. interstate, interstate highway
one of the system of highways linking major cities in the 48 contiguous states of the United States
"interstate" in the adjective sense
1. interstate
involving and relating to the mutual relations of states especially of the United States
"Interstate Highway Commission"
"interstate highways"
"Interstate Commerce Commission"
"interstate commerce"
Source: WordNet® (An amazing lexical database of English)
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