S.I.

名词 s.i.:

1. a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
   同义词：Systeme International d'Unites, Systeme International, SI system, SI, International System of Units, International System
2. 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
   同义词：silicon, Si, atomic number 14
3. the syllable naming the seventh (subtonic) note of any musical scale in solmization
   同义词：ti, te, si