1.  dc(n = noun.location) d.c., district of columbia - the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the United States and created out of land ceded by Maryland and Virginia;
is a kind of federal district
is a part of america, the states, u.s., u.s.a., united states, united states of america, us, usa
has parts: american capital, capital of the united states, washington, washington d.c.

2.  dc(n = noun.phenomenon) direct current, direct electric current - an electric current that flows in one direction steadily;
is a kind of electrical energy, electricity

dc, abbr.
1 (also d.c.) direct current.
2 District of Columbia.
3 da capo.
4 District Commissioner.