Webster's English Dictionary

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diffusion

dif.fu.sion \dif-'yu:-zh*n\ \-'yu:zh-n*l, -*n-*l\ n 1: the action of 
   diffusing or state of being diffused  2: DIFFUSENESS, PROLIXITY  3a: the 
   process whereby particles of liquids, gases, or solids intermingle  as the 
   result of their spontaneous movement and in dissolved substances move from 
   a region of higher to one of lower concentration 3b1: reflection of light 
   by a rough reflecting surface  3b2: transmission of light through a 
   translucent material  4: the softening of sharp outlines in a photographic 
   image  - dif.fu.sion.al aj