Source : Webster's Revised Unabridged Dictionary (1913)

Dispersal \Dis*per"sal\, n.
   The act or result of dispersing or scattering; dispersion.
   --Darwin.

Source : WordNet®

dispersal
     n : the act of dispersing or diffusing something; "the
         dispersion of the troops"; "the diffusion of knowledge"
         [syn: {dispersion}, {dissemination}, {diffusion}]