The Collaborative International Dictionary of English v.0.48:

dissemination \dis*sem`i*na"tion\, n. [L. disseminatio: cf. F.
   diss['e]mination.]
   The act of disseminating, or the state of being disseminated;
   diffusion for propagation and permanence; a scattering or
   spreading abroad, as of ideas, beliefs, etc.
   [1913 Webster]

         The universal dissemination of those writings.
                                                  --Wayland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dissemination
    n 1: the opening of a subject to widespread discussion and
         debate [syn: dissemination, airing, public exposure,
         spreading]
    2: the property of being diffused or dispersed [syn:
       dissemination, diffusion]
    3: the act of dispersing or diffusing something; "the dispersion
       of the troops"; "the diffusion of knowledge" [syn:
       dispersion, dispersal, dissemination, diffusion]