Source : Webster's Revised Unabridged Dictionary (1913)

Aggravation \Ag`gra*va"tion\, n. [LL. aggravatio: cf. F.
   aggravation.]
   1. The act of aggravating, or making worse; -- used of evils,
      natural or moral; the act of increasing in severity or
      heinousness; something additional to a crime or wrong and
      enhancing its guilt or injurious consequences.

   2. Exaggerated representation.

            By a little aggravation of the features changed it
            into the Saracen's head.              --Addison.

   3. An extrinsic circumstance or accident which increases the
      guilt of a crime or the misery of a calamity.

   4. Provocation; irritation. [Colloq.] --Dickens.

Source : WordNet®

aggravation
     n 1: an exasperated feeling of annoyance [syn: {exasperation}]
     2: unfriendly behavior that causes anger or resentment [syn: {irritation},
         {provocation}]
     3: action that makes a problem or a disease (or its symptoms)
        worse; "the aggravation of her condition resulted from
        lack of care" [syn: {exacerbation}]