The common tunny, or horse mackerel.
- A unit of weight equal to 2,000 pounds (0.907 metric ton or 907.18 kilograms). Also called net ton, short ton.
- A unit of weight equal to 2,240 pounds (1.016 metric tons or 1,016.05 kilograms). Also called long ton.
- A metric ton. See Table at measurement.
- A unit of capacity for cargo in maritime shipping, normally estimated at 40 cubic feet.
- A unit of internal capacity of a ship equal to 100 cubic feet.
- A unit for measuring the displacement of ships, equal to 35 cubic feet, and supposed to equal the volume taken by a long ton of seawater.
- Informal A large extent, amount, or number. Often used in the plural: has a ton of work; gets tons of fan mail.
- Informal Used adverbially with a or in the plural to mean "to a great degree or extent” or "frequently”: felt a ton better; has seen her tons lately.