Etymology
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tonnage (n.)

early 15c., "tax or duty on wine imported in tuns," from ton (n.1) + -age, and from Old French tonnage "duty levied on wine in casks" (c. 1300). Meaning "carrying capacity of a ship" is from 1718.

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Definitions of tonnage

tonnage (n.)
a tax imposed on ships that enter the US; based on the tonnage of the ship;
Synonyms: tunnage / tonnage duty
From wordnet.princeton.edu