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Definitions of Si:

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
noun:   the syllable naming the seventh (subtonic) note of any musical scale in solmization
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)
name:  A surname (very rare: popularity rank in the U.S.: #39223)

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Alternative Terms
si units-of-measurement base-unit international-bureau-of-weights-and-measures radian angle steradian solid-angle symbol physical-quantity hertz frequency newton force weight pascal pressure stress-physics joule energy work-physics-in-encyclopedia heat watt-surname power coulomb electric-charge flux volt potential-difference electromotive-force farad capacitance georg-ohm electrical-resistance electrical-impedance reactance electrical-conductance weber magnetic-flux tesla-unit magnetic-field henry-unit inductance celsius temperature lumen luminous-flux luxembourg-findel-international-airport illuminance becquerel radioactive-decay gray absorbed-dose ionizing-radiation equivalent-dose katal catalysis planck-units watt turn gravitational-system flik metre-squared-per-second msv area-density metre-per-second-squared

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