noun

*pl.*

- a unit of weight, equal to 2,000 pounds avoirdupois (907.1847 kilograms or 0.90718 metric ton or 0.8929 long ton), commonly used in the U.S., Canada, South Africa, etc.in full short ton
- a unit of weight, equal to 2,240 pounds avoirdupois (1,016.0469 kilograms or 1.016 metric tons or 1.12 short tons), commonly used in Great Britainin full long ton
- metric ton
- a unit of internal capacity of ships, equal to 100 cubic feet (or 2.8317 cubic meters)in full register ton
- a unit of carrying capacity of ships, usually equal to 40 cubic feetalso called
*measurement ton*or*freight ton* - a unit for measuring displacement of ships, equal to 35 cubic feet: it is approximately equal to the volume of a long ton of sea waterin full displacement ton
Origin of ton

so named from being equal to the amount of heat needed to freeze one*ton*of water in 24 hours a unit of cooling capacity of an air conditioner, equal to 12,000 Btu per hour- [
*often pl.*]Informal a very large amount or number

Origin of ton

variant, variety (differentiated in 17th circa for senses “weight, measure”) of tun