Source : Webster's Revised Unabridged Dictionary (1913)

Gratify \Grat"i*fy\, v. t. [imp. & p. p. {Gratified}; p. pr. &
   vb. n. {Gratifying}.] [F. gratifier, L. gratificari; gratus
   pleasing + -ficare (in comp.) to make. See {-fy}.]
   1. To please; to give pleasure to; to satisfy; to soothe; to
      indulge; as, to gratify the taste, the appetite, the
      senses, the desires, the mind, etc.

            For who would die to gratify a foe?   --Dryden.

   2. To requite; to recompense. [Obs.]

            It remains . . . To gratify his noble service.
                                                  --Shak.

   Syn: To indulge; humor please; delight; requite; recompense.

   Usage: To {Gratify}, {Indulge}, {Humor.} Gratify, is the
          generic term, and has reference simply to the pleasure
          communicated. To indulge a person implies that we
          concede something to his wishes or his weaknesses
          which he could not claim, and which had better,
          perhaps, be spared. To humor is to adapt ourselves to
          the varying moods, and, perhaps, caprices, of others.
          We gratify a child by showing him the sights of a
          large city; we indulge him in some extra expense on
          such an occasion; we humor him when he is tired and
          exacting.

Source : WordNet®

gratifying
     adj 1: giving pleasure or satisfaction [syn: {appreciated}, {pleasing},
             {satisfying}]
     2: occasioning pride; "a gratifying (or proud) achievement"
     3: pleasing to the mind or feeling; "sweet revenge" [syn: {sweet}]
     4: affording satisfaction or pleasure; "the company was
        enjoyable"; "found her praise gratifying"; "full of
        happiness and pleasurable excitement"; "good printing
        makes a book more pleasurable to read" [syn: {enjoyable},
        {pleasurable}]