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SI

Definition:

1. [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); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
   Synonyms: Systeme International d'Unites, Systeme International, SI system, SI, International System of Units, International System
   
   
2. [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
   Synonyms: licon, Si, atomic number 14
   
   
3. [noun] the syllable naming the seventh (subtonic) note of any musical scale in solmization
   Synonyms: ti, te
   
   

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