direct current

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An electric current flowing in one direction only.

from the GNU version of the Collaborative International Dictionary of English.

• A current flowing in one direction only; -- distinguished from alternating current. When steady and not pulsating a direct current is often called a continuous current.
• A direct induced current, or momentary current of the same direction as the inducing current, produced by stopping or removing the latter; also, a similar current produced by removal of a magnet.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an electric circuit in which voltage and current do not vary with time
• noun an electric current in which the electrons flow in one direction, but may vary with time

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an electric current that flows in one direction steadily