Definition of: tonnage

(tun′ij) noun
1. The cubic capacity of a merchant vessel expressed in tons of 100 cubic feet each.
2. The freight–carrying capacity of a vessel.
3. The aggregate freightage of a collection of vessels, especially of a country's merchant marine, as represented by their registered cubic capacity.
4. A tax levied on vessels at a given rate per ton.
5. The total weight of materials produced, mined, or transported. [<OF <tonne a ton, tun]