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Dictionary definition for: Si

1. (n) 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 (can

2. (n) 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

3. (n) the syllable naming the seventh (subtonic) note of any musical scale in solmization

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