Webster
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Webster’s Revised Unabridged Dictionary · 1913

Tonnage

Ton′nage, n. [From Ton a measure.]

1. The weight of goods carried in a boat or a ship.

2. The cubical content or burden of a vessel, or vessels, in tons; or, the amount of weight which one or several vessels may carry. See Ton, n. (b).

A fleet . . . with an aggregate tonnage of 60,000 seemed sufficient to conquer the world. Motley.

3. A duty or impost on vessels, estimated per ton, or, a duty, toll, or rate payable on goods per ton transported on canals.

4. The whole amount of shipping estimated by tons; as, the tonnage of the United States. See Ton.

☞ There are in common use the following terms relating to tonnage: (a) Displacement. (b) Register tonnage, gross and net. (c) Freight tonnage. (d) Builders' measurement. (e) Yacht measurement. The first is mainly used for war vessels, where the total weight is likely to be nearly constant. The second is the most important, being that used for commercial purposes. The third and fourth are different rules for ascertaining the actual burden-carrying power of a vessel, and the fifth is for the proper classification of pleasure craft. Gross tonnage expresses the total cubical interior of a vessel; net tonnage, the cubical space actually available for freight-carrying purposes. Rules for ascertaining these measurements are established by law.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.