Si

1. (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: atomic number 14, silicon
Related Words: chemical element, element

2. (noun) the syllable naming the the seventh (subtonic) note of any musical scale in solmization
Synonyms: te, ti
Related Words: solfa syllable

3. (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)
Synonyms: International System, Systeme International, Systeme International d'Unites
Related Words: metric system



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