noun
international unit; SI unit; IU
Technical term used in physics and related fields. Can refer to SI units or International Units (IU) depending on context.
国際単位系では、長さの基本単位はメートルです。
In the International System of Units, the base unit of length is the meter.
国際単位系 refers specifically to the International System of Units (SI) as a whole, while 国際単位 can mean any international unit, including SI units or IU.
Compound of 国際 (international) and 単位 (unit). A straightforward modern technical term.