Source : Webster's Revised Unabridged Dictionary (1913)

G \G\ (j[=e])
   1. G is the seventh letter of the English alphabet, and a
      vocal consonant. It has two sounds; one simple, as in
      gave, go, gull; the other compound (like that of j), as in
      gem, gin, dingy. See Guide to Pronunciation, [sect][sect]
      231-6, 155, 176, 178, 179, 196, 211, 246.

   Note: The form of G is from the Latin, in the alphabet which
         it first appeared as a modified form of C. The name is
         also from the Latin, and probably comes to us through
         the French. Etymologically it is most closely related
         to a c hard, k y, and w; as in corn, grain, kernel; kin
         L. genus, Gr. ?; E. garden, yard; drag, draw; also to
         ch and h; as in get, prehensile; guest, host (an army);
         gall, choler; gust, choose. See {C}.

   2. (Mus.) G is the name of the fifth tone of the natural or
      model scale; -- called also {sol} by the Italians and
      French. It was also originally used as the treble clef,
      and has gradually changed into the character represented
      in the margin. See {Clef}. G[sharp] (G sharp) is a tone
      intermediate between G and A.

Source : WordNet®

g
     n 1: a metric unit of weight equal to one thousandth of a
          kilogram [syn: {gram}, {gramme}, {gm}]
     2: a purine base found in DNA and RNA; pairs with cytosine
        [syn: {guanine}]
     3: one of the four nucleotides used in building DNA; all four
        nucleotides have a common phosphate group and a sugar
        (ribose) [syn: {deoxyguanosine monophosphate}]
     4: the cardinal number that is the product of 10 and 100 [syn:
        {thousand}, {one thousand}, {1000}, {M}, {K}, {chiliad}, {grand},
         {thou}, {yard}]
     5: a unit of force equal to the force exerted by gravity; used
        to indicate the force to which a body is subjected when it
        is accelerated [syn: {gee}, {g-force}]
     6: a unit of information equal to one billion (1,073,741,824)
        bytes or 1024 megabytes [syn: {gigabyte}, {GB}]
     7: (physics) the universal constant relating force to mass and
        distance in Newton's law of gravitation [syn: {gravitational
        constant}, {universal gravitational constant}, {constant
        of gravitation}]
     8: the 7th letter of the Roman alphabet

Source : Free On-Line Dictionary of Computing

     
         grin.  An alternative to {smiley}.
     
        [{Jargon File}]
     
        (1998-01-18)

G
     
        1.  ["G: A Functional Language with Generic Abstract
        Data Types", P.A.G. Bailes, Computer Langs 12(2):69-94
        (1987)].
     
        2.  A language developed at {Oregon State
        University} in 1988 which combines {functional programming},
        {object-oriented programming}, relational, {imperative} and
        {logic programming} (you name it we got it).
     
        ["The Multiparadigm Language G", J. Placer, Computer Langs
        16:235-258(1991)].
     
        3.  The abbreviated form of {giga-}.
     
        [{Jargon File}]
     
        (1996-08-12)