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]

Moby Thesaurus II by Grady Ward, 1.0:

103 Moby Thesaurus words for "disseminate":
   advertise, announce, annunciate, assign, bed, bestrew, blazon,
   broadcast, carry over, circulate, circumfuse, communicate, consign,
   convey, deal out, deliver, deport, dibble, diffract, diffuse,
   dispense, disperse, dispread, distribute, diverge, drill, expel,
   export, extradite, fan out, forest, get across, get over, give,
   give word, hand forward, hand on, hand over, impart, implant,
   import, inseminate, issue, leave word, make known, make over,
   metastasize, metathesize, overscatter, oversow, overspread, pass,
   pass along, pass on, pass over, pass the buck, perfuse, plant, pot,
   proclaim, promulgate, propagate, publish, put in, radiate,
   reforest, relay, render, report, reset, retail, retimber, scatter,
   scatter seed, seed, seed down, seminate, send, send word, set,
   share, share with, signal, sow, sow broadcast, splay, spread,
   spread out, straw, strew, switch, tell, transfer,
   transfer property, transfuse, translate, translocate, transmit,
   transplace, transplant, transpose, turn over, utter