WordNet sense 1 (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):

silicon

WordNet sense 2 (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)):

Systeme International d'Unites, International System, International System of Units, SI system, Systeme International

WordNet sense 3 (the syllable naming the seventh (subtonic) note of any musical scale in solmization):

ti, te