What does "base unit" mean?

A unit of measurement which is not itself defined in terms of other units, and from which other units may be derived.

Base unit

Common synonyms include: a hundred, base cabinets, measurement unit, primary unit, sole unit, standard unit.

noun

noun ·Rare ·Advanced level

Noun

1
A unit of measurement which is not itself defined in terms of other units, and from which other units may be derived.
"The SI unit of velocity is metres per second, derived from the base units metre and second."
2
The main unit of a computer or hi-fi system.
"When upgrading her computer she bought a new base unit but kept the screen, keyboard and mouse."

"The SI unit of velocity is metres per second, derived from the base units metre and second."