Source : Webster's Revised Unabridged Dictionary (1913)

S \S\ ([e^]s),
   the nineteenth letter of the English alphabet, is a
   consonant, and is often called a sibilant, in allusion to its
   hissing sound. It has two principal sounds; one a mere
   hissing, as in sack, this; the other a vocal hissing (the
   same as that of z), as in is, wise. Besides these it
   sometimes has the sounds of sh and zh, as in sure, measure.
   It generally has its hissing sound at the beginning of words,
   but in the middle and at the end of words its sound is
   determined by usage. In a few words it is silent, as in isle,
   d['e]bris. With the letter h it forms the digraph sh. See
   Guide to pronunciation, [sect][sect] 255-261.

   Note: Both the form and the name of the letter S are derived
         from the Latin, which got the letter through the Greek
         from the Ph[ae]nician. The ultimate origin is Egyptian.
         S is etymologically most nearly related to c, z, t, and
         r; as, in ice, OE. is; E. hence, OE. hennes; E. rase,
         raze; erase, razor; that, G. das; E. reason, F. raison,
         L. ratio; E. was, were; chair, chaise (see C, Z, T, and
         R.).

Source : WordNet®

s
     n 1: 1/60 of a minute; the basic unit of time adopted under the
          Systeme International d'Unites [syn: {second}, {sec}]
     2: an abundant tasteless odorless multivalent nonmetallic
        element; best known in yellow crystals; occurs in many
        sulphide and sulphate minerals and even in native form
        (especially in volcanic regions) [syn: {sulfur}, {sulphur},
         {atomic number 16}]
     3: the cardinal compass point that is at 180 degrees [syn: {south},
         {due south}]
     4: a unit of conductance equal to the reciprocal of an ohm
        [syn: {mho}, {siemens}, {reciprocal ohm}]
     5: the 19th letter of the Roman alphabet
     6: (thermodynamics) a thermodynamic quantity representing the
        amount of energy in a system that is no longer available
        for doing mechanical work; "entropy increases as matter
        and energy in the universe degrade to an ultimate state of
        inert uniformity" [syn: {randomness}, {entropy}]

Source : Free On-Line Dictionary of Computing

S
     
         A statistical analysis language from {AT&T}.
     
        ["S: An Interactive Environment for Data Analysis and
        Graphics", Richard A. Becker, Wadsworth 1984].
     
        (1997-01-21)

s///
     
         s/{foo}/{bar}/ is an idiom which means "I didn't mean
        to type 'foo', I meant to type 'bar'".
     
        Its use in {talk} systems, especially {irc}, comes from the
        use of s/// as a substitution operator in {Perl}, {sed} and
        {ed}.  In these languages and tools, s/foo/bar/ would replace
        any substring matching the {regular expression} "foo" with the
        string "bar".
     
        (1997-03-16)