1. sis - noun
· a female person who has the same parents as another person; "my sister married a musician"
2. 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
3. si - 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); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
4. si - noun
· the syllable naming the seventh (subtonic) note of any musical scale in solmization
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