Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

Comprehensive
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D.C. abbreviation of "da capo," from the beginning (used in music as a direction to repeat a passage).
DC1 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.
DC2 abbreviation of "direct current," an electric current that flows in one direction. (Cf. "AC.")