Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun si

3 senses of si

Sense 1
silicon, Si, atomic number 14 -- (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)
       => chemical element, element -- (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
       => semiconductor, semiconducting material -- (a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities)

Sense 2
Systeme International d'Unites, Systeme International, SI system, SI, SI unit, International System of Units, International System -- (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); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites")
       => metric system -- (a decimal system of weights and measures based on the meter and the kilogram and the second)

Sense 3
ti, te, si -- (the syllable naming the seventh (subtonic) note of any musical scale in solmization)
       => solfa syllable -- (one of the names for notes of a musical scale in solmization)