Set of base units, together with derived units, defined in accordance with given rules, for a given system of quantities, e.g. Système International d'Unités (
SI).
Source:
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 995 (https://doi.org/10.1351/pac199668040957)