from The American Heritage® Dictionary of the English Language, 4th Edition
- A region of the north-central United States around the Great Lakes and the upper Mississippi Valley. It is generally considered to include Ohio, Indiana, Illinois, Michigan, Wisconsin, Minnesota, Iowa, Missouri, Kansas, and Nebraska. The area is known for its rich farmlands and highly industrialized centers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. The area of the continental United States contained in the central third of the of the country, especially the states of Illinois, Indiana, Iowa, Michigan, Minnesota, Ohio, and Wisconsin.
from the GNU version of the Collaborative International Dictionary of English
- n. The north central region of the U. S.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the north central region of the United States (sometimes called the heartland or the breadbasket of America)
mid- + West (Wiktionary)