Tonnage vs Dwt - What's the difference?
As a noun tonnage
The number of tons of water that a floating ship displaces.
The capacity of a ship's hold etc in units of 100 cubic feet.
The number of tons of bombs dropped in a particular region over a particular period of time.
A charge made on each ton of cargo when landed etc.
The total shipping of a fleet or nation.
* (charge per ton) cranage, demurrage, shippage, shorage, wharfage