The Collaborative International Dictionary of English v.0.48:

Glad \Glad\ (gl[a^]d), a. [Compar. Gladder; superl.
   Gladdest.] [AS. gl[ae]d bright, glad; akin to D. glad
   smooth, G. glatt, OHG. glat smooth, shining, Icel. gla[eth]r
   glad, bright, Dan. & Sw. glad glad, Lith. glodas smooth, and
   prob. to L. glaber, and E. glide. Cf. Glabrous.]
   [1913 Webster]
   1. Pleased; joyous; happy; cheerful; gratified; -- opposed to
      sorry, sorrowful, or unhappy; -- said of persons,
      and often followed by of, at, that, or by the infinitive,
      and sometimes by with, introducing the cause or reason.
      [1913 Webster]

            A wise son maketh a glad father.      --Prov. x. 1.
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            He that is glad at calamities shall not be
            unpunished.                           --Prov. xvii.
                                                  5.
      [1913 Webster]

            The Trojan, glad with sight of hostile blood.
                                                  --Dryden.
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            He, glad of her attention gained.     --Milton.
      [1913 Webster]

            As we are now glad to behold your eyes. --Shak.
      [1913 Webster]

            Glad am I that your highness is so armed. --Shak.
      [1913 Webster]

   Glad on 't, glad of it. [Colloq.] --Shak.
      [1913 Webster]

   2. Wearing a gay or bright appearance; expressing or exciting
      joy; producing gladness; exhilarating.
      [1913 Webster]

            Her conversation
            More glad to me than to a miser money is. --Sir P.
                                                  Sidney.
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            Glad evening and glad morn crowned the fourth day.
                                                  --Milton.

   Syn: Pleased; gratified; exhilarated; animated; delighted;
        happy; cheerful; joyous; joyful; cheering; exhilarating;
        pleasing; animating.

   Usage: Glad, Delighted, Gratified. Delighted expresses
          a much higher degree of pleasure than glad. Gratified
          always refers to a pleasure conferred by some human
          agent, and the feeling is modified by the
          consideration that we owe it in part to another. A
          person may be glad or delighted to see a friend, and
          gratified at the attention shown by his visits.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glad \Glad\, v. t. [imp. & p. p. Gladded; p. pr. & vb. n.
   Gladding.] [AS. gladian. See Glad, a., and cf. Gladden,
   v. t.]
   To make glad; to cheer; to gladden; to exhilarate. --Chaucer.
   [1913 Webster]

         That which gladded all the warrior train. --Dryden.
   [1913 Webster]

         Each drinks the juice that glads the heart of man.
                                                  --Pope.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glad \Glad\, v. i.
   To be glad; to rejoice. [Obs.] --Massinger.
   [1913 Webster]

WordNet (r) 3.0 (2006):

glad
    adj 1: showing or causing joy and pleasure; especially made
           happy; "glad you are here"; "glad that they succeeded";
           "gave a glad shout"; "a glad smile"; "heard the glad
           news"; "a glad occasion" [ant: sad]
    2: eagerly disposed to act or to be of service; "glad to help"
       [syn: glad, happy]
    3: feeling happy appreciation; "glad of the fire's warmth"
    4: cheerful and bright; "a beaming smile"; "a glad May morning"
       [syn: beaming, glad]
    n 1: any of numerous plants of the genus Gladiolus native
         chiefly to tropical and South Africa having sword-shaped
         leaves and one-sided spikes of brightly colored funnel-
         shaped flowers; widely cultivated [syn: gladiolus,
         gladiola, glad, sword lily]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "glad":
   animating, beaming, beatific, beatified, beautiful, blessed,
   blissful, blithe, blithesome, bright, bright and sunny, capering,
   charmed, cheerful, cheering, cheery, chirping, chuffed,
   comfortable, content, contented, cozy, dancing, delighted, eager,
   easy, elated, encouraging, enlivening, eupeptic, euphoric, exalted,
   exhilarated, exhilarating, favorably impressed with, flushed,
   flushed with joy, gay, genial, gladdening, gladsome, gleeful,
   glowing, gratified, happy, heart-warming, heartening, high,
   hilarious, hopeful, in clover, in good spirits, in high spirits,
   inclined, inspiring, inspiriting, intrigued, invigorating,
   irrepressible, jocund, jolly, jovial, joyful, joyous, keen,
   laughing, leaping, lighthearted, merry, mirthful, of good cheer,
   optimistic, overjoyed, pleasant, pleased, pleased as Punch,
   pleased with, purring, radiant, ready, ready and willing, rejoiced,
   riant, rosy, sanguine, sanguineous, satisfied, singing, smiling,
   smirking, sold on, sparkling, starry-eyed, sunny, taken with,
   thrice happy, thrilled, tickled, tickled pink, tickled to death,
   well-disposed, winsome