ton·nage

[tuhn-ij]
noun
1.
the capacity of a merchant vessel, expressed either in units of weight, as deadweight tons, or of volume, as gross tons.
2.
ships collectively considered with reference to their carrying capacity or together with their cargoes.
3.
a duty on ships or boats at so much per ton of cargo or freight, or according to the capacity in tons.
Also, tunnage.


Origin:
1375–1425; late Middle English: duty < Old French. See ton1, -age

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
tonnage or tunnage (ˈtʌnɪdʒ) [Click for IPA pronunciation guide]
 
n
1.  the capacity of a merchant ship expressed in tons, for which purpose a ton is considered as 40 cubic feet of freight or 100 cubic feet of bulk cargo, unless such an amount would weigh more than 2000 pounds in which case the actual weight is used
2.  the weight of the cargo of a merchant ship
3.  the total amount of shipping of a port or nation, estimated by the capacity of its ships
4.  a duty on ships based either on their capacity or their register tonnage
 
[C15: from Old French, from tonne barrel]
 
tunnage or tunnage
 
n
 
[C15: from Old French, from tonne barrel]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Tonnage is always a great word to know.
So is interrobang. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Encyclopedia Britannica
Encyclopedia

tonnage

in shipping, the total number of tons registered or carried, or the total carrying capacity.

Learn more about tonnage with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Not until the middle of the century did the tonnage of steamships upon the sea
  begin to overhaul that of sailing ships.
The price of old liners depend on the tonnage, the market for steel, and the
  furnishings.
The public imagines a nation's impact on the sea in terms of the raw tonnage of
  fish it catches.
The fantasies are shaped not only by the comforts of the cars but by their
  sheer tonnage as well.
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