n 1: 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 [syn: silicon, Si, atomic number 14] 2: 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); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites" [syn: Systeme International d'Unites, Systeme International, SI system, SI, SI unit, International System of Units, International System] 3: the syllable naming the seventh (subtonic) note of any musical scale in solmization [syn: ti, te, si]
Si Si [It.] (Mus.) A syllable applied, in solmization, to the note B; more recently, to the seventh tone of any major diatonic scale. It was added to Guido's scale by Le Maire about the end of the 17th century.