tonnage

1. The number of tons of water that a ship displaces when afloat.
2. The capacity of a merchant ship in units of 100 cubic feet.
3. A duty or charge per ton on cargo, as at a port or canal.
4. The total shipping of a country or port, figured in tons, with reference to carrying capacity.
5. Weight measured in tons.

Origin:

Origin: ton

Origin: + -age

Origin: . Sense 3, Middle English

Origin: , from Old French

Origin: , from tonne, tun; see tonne