Meaning of DC in English

DC

(UNITED STATES) [noun] [U] - abbreviation for the District of Columbia (= an area of the eastern US which has the same borders as the US capital, Washington, and which is not part of a US state)Summer in DC can be brutally hot.In 1986 the estimated population of Washington, DC was 626 000.

Cambridge English vocab.      Кембриджский английский словарь.