- between or involving two or more of the states of the US, Australia, etc
- US a highway that runs between states
WordReference Random House Learner's Dictionary of American English © 2026
in•ter•state /adj. ˌɪntɚˈsteɪt; n. ˈɪntɚˌsteɪt/USA pronunciation
adj. [before a noun]
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- connecting or involving different states:an interstate highway; interstate trade.
n. [countable]
- Transport[sometimes: Interstate] a highway that is part of a nationwide U.S. system of highways connecting major cities.
in•ter•state
(adj. in′tər stāt′;n. in′tər stāt′),USA pronunciation adj.
n.
- connecting or involving different states:interstate commerce.
n.
- Transporta highway serving two or more states.
- Transport(sometimes cap.) a highway that is part of the nationwide U.S. Interstate Highway System.
- inter- + state 1835–45, American.
Collins Concise English Dictionary © HarperCollins Publishers::
interstate /ˈɪntəˌsteɪt/ adj
'interstate' also found in these entries (note: many are not synonyms or translations):