[ adjective in-ter-steyt; noun in-ter-steyt ]
/ adjective ˌɪn tərˈsteɪt; noun ˈɪn tərˌsteɪt /


connecting or involving different states: interstate commerce.


a highway serving two or more states.
(sometimes initial capital letter) a highway that is part of the nationwide U.S. Interstate Highway System.

Nearby words

  1. interspersion,
  2. interspinal muscle,
  3. interspinal plane,
  4. interstade,
  5. interstadial,
  6. interstate commerce commission,
  7. interstate highway system,
  8. interstellar,
  9. interstellar medium,
  10. interstellar space

Origin of interstate

An Americanism dating back to 1835–45; inter- + state

Related formsnon·in·ter·state, adjective

Can be confusedinterstate intestate intrastate Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for interstate

British Dictionary definitions for interstate


/ (ˈɪntəˌsteɪt) /


between or involving two or more of the states of the US, Australia, etc


Australian to or into another state


US a motorway crossing between states
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for interstate



1845, from inter- + state (n.). As "an interstate highway," by 1986, American English.

Online Etymology Dictionary, © 2010 Douglas Harper