1. [ noun ] a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) mass (kilogram) time (second) electric current (ampere) temperature (kelvin) amount of matter (mole) and luminous intensity (candela)
Synonyms: Systeme_International International_System international_system_of_units si_system Systeme_International_d'Unites
Related terms: metric_system
2. [ noun ] (chemistry,physics,electronics) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
Synonyms: atomic_number_14 silicon
Related terms: chemical_element semiconductor clay sand silicone granite feldspar quartz
3. [ noun ] (music,linguistics) the syllable naming the seventh (subtonic) note of any musical scale in solmization
Synonyms: te ti
Related terms: solfa_syllable
Similar spelling:   Siu