Système International unit: a standard scientific unit of measurement in an international system. The main units are the metre, kilogram, second, ampere, kelvin, and mole.
Synonyms and related words
Describing or relating to units of measurement
absolute
calibration
exa-
SI unit
noun countable science
US /ˌes ˈaɪ ˌjunɪt/
Word Forms
singular
SI unit
plural
SI units
DEFINITIONS1
1
Système International unit: a standard scientific unit of measurement in an international system. The main units are the meter, kilogram, second, ampere, kelvin, and mole.