Source : Webster's Revised Unabridged Dictionary (1913)

Outbreak \Out"break`\, n.
   A bursting forth; eruption; insurrection. ``Mobs and
   outbreaks.'' --J. H. Newman.

         The flash and outbreak of a fiery mind.  --Shak.

Source : WordNet®

outbreak
     n : a sudden violent spontaneous occurrence (usually of some
         undesirable condition); "the outbreak of hostilities"
         [syn: {eruption}, {irruption}]