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D.C. [or] DC2

 
pronunciation:
di si
part of speech: abbreviation
definition: abbreviation of "District of Columbia," a federal area on the Maryland side of the Potomac River that encompasses only the U.S. capital city of Washington (often used informally to refer to the city.)
So, how long have you been living in D.C.?They live in Virginia, but they commute into D.C. every day.