base unit ( synonym found)
Definition of base unit:

(n) : a unit of measurement on which others are based; the main unit of a computer or hi-fi system
"the SI unit of velocity is metres per second, derived from the base units of time and distance."
Definition of base unit:

(n) : a unit of measurement on which others are based; the main unit of a computer or hi-fi system
"the SI unit of velocity is metres per second, derived from the base units of time and distance."
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