The Collaborative International Dictionary of English v.0.48:
Dispersal \Dis*per"sal\, n. The act or result of dispersing or scattering; dispersion. --Darwin. [1913 Webster]WordNet (r) 3.0 (2006):
dispersal n 1: the act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge" [syn: dispersion, dispersal, dissemination, diffusion]