si /ˈsi/
 系統資訊程式


 Si  Mus. A syllable applied, in solmization, to the note B; more recently, to the seventh tone of any major diatonic scale. It was added to Guido's scale by Le Maire about the end of the 17th century.

 ◄ ►


 SI
      n 1: 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"
           [syn: Systeme International d'Unites, {Systeme
           International, SI system, {International System of
           Units, International System]
      2: 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 [syn: silicon, {atomic
         number 14]
      3: the syllable naming the seventh (subtonic) note of any
         musical scale in solmization [syn: ti, te]