disconnect

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

• intransitive verb To sever or interrupt the connection of or between.
• intransitive verb Electricity To shut off the current in (an appliance) by removing its connection to a power source.
• intransitive verb To sever or interrupt a connection.
• noun A lack of connection; a disparity.

from The Century Dictionary.

• To sever or interrupt the connection of; break the connection of or between; disunite; disjoin: as, to disconnect a locomotive from a train; to disconnect church and state.
• To disjoin the parts of; deprive of connection or coherence; separate into parts; dissociate: as, to disconnect an engine by detaching the connecting-rod.

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

• transitive verb To dissolve the union or connection of; to disunite; to sever; to separate; to disperse.

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

• noun A break or interruption in an existing connection, continuum, or process; disconnection.
• noun A switch used to isolate a portion of an electrical circuit.
• noun A lack of connection or accord; a mismatch.
• noun Scientology The deliberate severing of ties with family, friends, etc. considered antagonistic towards Scientology.
• verb transitive To sever or interrupt a connection.
• verb intransitive To become detached or withdrawn.
• verb transitive To remove the connection between an appliance and an electrical power source.

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

• verb pull the plug of (electrical appliances) and render inoperable
• verb make disconnected, disjoin or unfasten
• noun an unbridgeable disparity (as from a failure of understanding)