D defs.my
Entry 4 senses Webster, 1913

Tonnage

/tŭn'-əj/ · Ton·nage · IPA /ˈtʌnɪd͡ʒ/
01 n. The weight of goods carried in a boat or a ship.
  1. 1.
    The weight of goods carried in a boat or a ship.
  2. 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). See: Ton
    “A fleet . . . with an aggregate tonnage of 60,000 seemed sufficient to conquer the world.” Motley.
  3. 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. 4.
    The whole amount of shipping estimated by tons; as, the tonnage of the United States. See Ton. See: Ton