demurrage

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

• noun Detention of a ship, freight car, or other cargo conveyance during loading or unloading beyond the scheduled time of departure.
• noun Compensation paid for such detention.

from The Century Dictionary.

• noun In maritime law:
• noun Any detention of a vessel by the freighter in loading or unloading beyond the time originally stipulated. When a vessel is thus detained she is said to be on demurrage.
• noun The compensation which the freighter has to pay for such delay or detention.
• noun Detention of railway-wagons, etc.
• noun A charge of 1½d. per ounce, made by the Bank of England in exchanging notes or coin for bullion.

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

• noun The detention of a vessel by the freighter beyond the time allowed in her charter party for loading, unloading, or sailing.
• noun The allowance made to the master or owner of the ship for such delay or detention.

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

• noun the detention of a ship or other freight vehicle, during delayed loading or unloading
• noun compensation paid for such detention
• noun a charge made for exchanging currency for bullion

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

• noun a charge required as compensation for the delay of a ship or freight car or other cargo beyond its scheduled time of departure
• noun detention of a ship or freight car or other cargo beyond its scheduled time of departure