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]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "dissemination":
   airing, attenuation, bandying, book, broadcast, broadcasting,
   bruiting, bruiting about, circulation, circumfusion, communication,
   conduction, contagion, convection, delivery, deportation,
   diapedesis, diffraction, diffusion, dilution, dispensation,
   dispersal, dispersion, display, dissipation, distribution,
   divergence, evaporation, evulgation, expansion, export,
   exportation, expulsion, extradition, fragmentation, import,
   importation, insemination, interchange, issuance, issue,
   metastasis, metathesis, metempsychosis, migration, mutual transfer,
   osmosis, passage, passing over, peppering, perfusion, periodical,
   planting, printing, promulgation, propagation, publication,
   publishing, radiation, reforestation, resetting, retimbering,
   scattering, scatterment, seeding, semination, setting,
   shotgun pattern, sowing, spattering, splay, spread, spreading,
   spreading abroad, sprinkling, strewing, telecasting, transduction,
   transfer, transfer of property, transference, transfusion, transit,
   transition, translation, translocation, transmigration,
   transmigration of souls, transmission, transmittal, transmittance,
   transplacement, transplantation, transposal, transposition, travel,
   ventilation, volatilization