Source : Webster's Revised Unabridged Dictionary (1913)

Aggravate \Ag"gra*vate\, v. t. [imp. & p. p. {Aggravated}; p.
   pr. & vb. n. {Aggravating}.] [L. aggravatus, p. p. of
   aggravare. See {Aggrieve}.]
   1. To make heavy or heavier; to add to; to increase. [Obs.]
      ``To aggravate thy store.'' --Shak.

   2. To make worse, or more severe; to render less tolerable or
      less excusable; to make more offensive; to enhance; to
      intensify. ``To aggravate my woes.'' --Pope.

            To aggravate the horrors of the scene. --Prescott.

            The defense made by the prisoner's counsel did
            rather aggravate than extenuate his crime.
                                                  --Addison.

   3. To give coloring to in description; to exaggerate; as, to
      aggravate circumstances. --Paley.

   4. To exasperate; to provoke; to irritate. [Colloq.]

            If both were to aggravate her parents, as my brother
            and sister do mine.                   --Richardson
                                                  (Clarissa).

   Syn: To heighten; intensify; increase; magnify; exaggerate;
        provoke; irritate; exasperate.

Source : WordNet®

aggravate
     v 1: make worse; "This drug aggravates the pain" [syn: {worsen},
          {exacerbate}, {exasperate}] [ant: {better}]
     2: exasperate or irritate [syn: {exacerbate}, {exasperate}]