Reference meaning
Si
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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
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Other meanings
2. 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)
3. noun
the syllable naming the seventh (subtonic) note of any musical scale in solmization
Source and scope
This definition is reproduced from Princeton WordNet 3.0, sense 14654541-n, under the WordNet 3.0 License. It has not yet received VocabularyBase editorial review. Read the source and license details.