- Interstate is defined as between or among states.
An example of something interstate is trade between two states; interstate commerce.
- The definition of an interstate is one highway in a network of highways that connect the 48 connected United States.
An example of an interstate is I-80.
A sign pointing to an interstate highway.
interstate definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
between or among states esp. of the U.S.: interstate commerce
one of a network of U.S. highways connecting the 48 contiguous states
interstate definition by American Heritage Dictionary
Involving, existing between, or connecting two or more states.noun
One of a system of highways extending between the major cities of the 48 contiguous United States.