Definition of "tonnage"

tonnage

/ˈtʌnɪd͡ʒ/

noun
countable and uncountable, plural tonnages
1. The number of tons of water that a floating ship displaces.
  Quotations
  With her luxurious furnishings and spacious accommodation the Invicta, which is 350-ft. long and has a gross tonnage of 4,178, resembles a small liner.
  1947 January and February, “Notes and News: New Southern Channel Steamer”, in Railway Magazine, page 49
2. The capacity of a ship's hold etc in units of 100 cubic feet.
3. The number of tons of bombs dropped in a particular region over a particular period of time.
4. A charge made on each ton of cargo when landed etc.
5. The total shipping of a fleet or nation.