noun
expansion rate; growth rate
Technical term used in contexts such as business, infrastructure, or capacity planning to describe the rate at which something is being expanded or added.
来年度の設備増設率は前年比5%増を見込んでいる。
We expect the facility expansion rate next fiscal year to increase by 5% compared to the previous year.
この地域の回線増設率は需要に追いついていない。
The line expansion rate in this area is not keeping up with demand.
Compound of 増設 (expansion, addition of facilities) and 率 (rate). The exact historical derivation is uncertain, but the components are transparent.