The Collaborative International Dictionary of English v.0.48:

Si \Si\ [It.] (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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Maffioso \Maf`fi*o"so\, Mafioso \Ma`fi*o"so\, n.; pl. -si.
   [It. maffioso.]
   A member of the mafia.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Si
    n 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 [syn: silicon, Si, atomic
         number 14]
    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); "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, SI, SI
       unit, International System of Units, International
       System]
    3: the syllable naming the seventh (subtonic) note of any
       musical scale in solmization [syn: ti, te, si]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       Skyrslutaeknifelags Islands (org., Iceland)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       Source Index [register] (CPU, Intel, assembler)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       SPARC International (org., manufacturer)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       System Identifier (DTD, URI, SGML, FPI)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       System Information


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SI
       Schweizer Informatikergesellschaft (org., Switzerland)


The Free On-line Dictionary of Computing (30 December 2018):

SI

   1.  Système International.

   2.  Shift In.


The Free On-line Dictionary of Computing (30 December 2018):

si

    The country code for Slovenia.

   (1999-01-27)