Si - definition, pronunciation, transcription

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Amer.  |siː|  American pronunciation of the word si
Brit.  |siː|  British pronunciation of the word 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 (syn: silicon)
- 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)
- the syllable naming the seventh (subtonic) note of any musical scale in solmization
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