国こく際さい単たん位い

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.

• 国こく際さい単たん位い系けいでは、長ながさの基き本ほん単たん位いはメートルです。

  In the International System of Units, the base unit of length is the meter.