The District of Columbia at twilight.
District of Columbia 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.
federal district of the U.S., on the N bank of the Potomac River: 61 sq mi (159 sq km); pop. 572,000; coextensive with the city of Washington: abbrev. DC or D.C.
Origin: after Christopher Columbus
District of Columbia definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Abbr. DC or D.C.
A federal district of the eastern United States on the Potomac River between Virginia and Maryland. Coextensive with the city of Washington, it was established by congressional acts of 1790 and 1791 on a site selected by George Washington.