<chemistry, physics> An International System of Units of measurement in which the fundamental units are standardised. ... Examples include: metre, kilometre, ampere, gray, joule, Sievert, Becquerel. ... Origin: Fr. Le Systeme International d'Unites ... (18 Nov 1997) ... Found on http://www.encyclo.co.uk/local/20973
Stands for Systeme International d'Unites, a international system which established a uniform set of measurement units.
Found on http://www.shodor.org/UNChem/glossary.html