- the detention in port of a vessel by the shipowner, as in loading or unloading, beyond the time allowed or agreed upon.
- the similar undue detention of a railroad car, truck, etc.
- a charge for such undue detention.
- the delaying of a ship, railway wagon, etc, caused by the charterer’s failure to load, unload, etc, before the time of scheduled departure
- the extra charge required as compensation for such delay
- a fee charged by the Bank of England for changing bullion into notes
1640s, from Old French demorage, from demorer (see demur).