si Meaning, Definition & Usage
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noun 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
silicon; atomic number 14.
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noun 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)
Systeme International; SI unit; SI system; International System of Units; International System; Systeme International d'Unites.
- Today the United States is the only country in the world not totally committed to the Systeme International d'Unites
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noun the syllable naming the seventh (subtonic) note of any musical scale in solmization
te; ti.
WordNet
Si
Etymology
It.Definitions
(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. now called ti