There is no definite definition, it is just a name of a city. Washington (George) named the capital Washington D.C. after him. He couldn't name it just Washington, because there was a Washington State. D. C. means "District of Columbia." because Washington D.C. isn't a definite part of any state... actually, it is in Virginia and Maryland, right on the border (if you don't know where that is, on a map it is on the right (east) side of the USA, next to the Atlantic Ocean.).
the seat of the US Congress in Washington, DC.
Washington dc is not a state.
Washington, DC
Washington DC
Washington - Baltimore Washington International, DC, USA (BWI) Washington - Washington - All Airports, DC, USA (WAS) Washington - Ronald Reagan National Airport, DC, USA (DCA) Washington - Washington Dulles, DC, USA (IAD)
there are no counties in Washington DC because Washington DC is a city itself.
Washington DC
Washington, DC
On the mall in Washington, DC.
Washington DC was named by george washington.
Washington is the state of the United States and Washington DC is the capital.
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