Webster's English Dictionary

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dispersion

dis.per.sion \dis-'p*r-zh*n, -sh*n\ n cap  1: DIASPORA  2: the act or 
   process of dispersing : the state of being dispersed  3: the scattering of 
   the values of a frequency distribution from an average  4: the separation 
   of light into colors by refraction or diffraction with fo rmation of a 
   spectrum; also : the separation of nonhomogeneous radiation into components 
   in accordance with some characteristic (as energy) 5a: a dispersed 
   substance  5b: a system consisting of a dispersed substance and the medium 
   in which it  is dispersed