interstate adj 1: involving and relating to the mutual relations of states especially of the United States; "Interstate Highway Commission"; "interstate highways"; "Interstate Commerce Commission"; "interstate commerce" [ant: {intrastate}] n 1: one of the system of highways linking major cities in the 48 contiguous states of the United States [syn: {interstate}, {interstate highway}]
Interstate \In"ter*state`\, a. Pertaining to the mutual relations of States; existing between, or including, different States; as, interstate commerce. --Story.
interstate \in"ter*state`\, n. An interstate highway, part of the United States Interstate Highway system. [PJC]