The Collaborative International Dictionary of English v.0.48:

Disseminate \Dis*sem"i*nate\, v. t. & i. [imp. & p. p.
   Disseminated; p. pr. & vb. n. Disseminating.] [L.
   disseminatus, p. p. of disseminare to disseminate; dis- +
   seminare to sow, semen seed. See Seminary.]
   1. to spread around widely; to sow broadcast or as seed; to
      scatter for growth and propagation, like seed; to spread
      abroad; to diffuse; as, principles, ideas, opinions, and
      errors are disseminated when they are spread abroad for
      propagation.
      [1913 Webster]

   2. To spread or extend by dispersion.
      [1913 Webster]

            A nearly uniform and constant fire or heat
            disseminated throughout the body of the earth.
                                                  --Woodward.

   Syn: To spread; diffuse; propagate; circulate; disperse;
        scatter.
        [1913 Webster]

WordNet (r) 3.0 (2006):

disseminate
    v 1: cause to become widely known; "spread information";
         "circulate a rumor"; "broadcast the news" [syn:
         circulate, circularize, circularise, distribute,
         disseminate, propagate, broadcast, spread,
         diffuse, disperse, pass around]