Source : Webster's Revised Unabridged Dictionary (1913)

Exasperation \Ex*as`per*a"tion\, n. [L. exasperatio: cf. F.
   exasp['e]ration.]
   1. The act of exasperating or the state of being exasperated;
      irritation; keen or bitter anger.

            Extorted from him by the exasperation of his
            spirits.                              --South.

   2. Increase of violence or malignity; aggravation;
      exacerbation. ``Exasperation of the fits.'' --Sir H.
      Wotton.

Source : WordNet®

exasperation
     n 1: an exasperated feeling of annoyance [syn: {aggravation}]
     2: actions that cause great irritation (or even anger)