noun-modifying (irregular)
according to usage; pay-as-you-go; metered
Used prenominally in compounds such as 従量制 (metered rate system) or 従量課金 (usage-based billing). Not used as a standalone adjective.
See also: 従量制
This service uses a pay-as-you-go billing system.
Electricity charges are calculated on a metered basis.
specific duty; specific tariff; specific tax
metered rate; usage-based charge
usage-based billing; pay-as-you-go system
Compound of 従 (follow, according to) and 量 (quantity, amount). The exact historical derivation is uncertain, but the term is used in modern technical and business contexts.