- a duty or tax on ships, based on tons carried
- a charge per ton on cargo or freight on a canal, at a port, etc.
- the total amount of shipping of a country or port, calculated in tons
- the carrying capacity of a ship, expressed in register tons
- the weight of water displaced by a warship, expressed in long tons
- weight in tons
Origin of tonnageMiddle English from MFr: see tun and -age