The Collaborative International Dictionary of English v.0.48:

Communication \Com*mu`ni*ca"tion\
   (k[o^]m*m[=u]`n[i^]*k[=a]"sh[u^]n), n. [L. communicatio.]
   1. The act or fact of communicating; as, communication of
      smallpox; communication of a secret.
      [1913 Webster]

   2. Intercourse by words, letters, or messages; interchange of
      thoughts or opinions, by conference or other means;
      conference; correspondence.
      [1913 Webster]

            Argument . . . and friendly communication. --Shak.
      [1913 Webster]

   3. Association; company.
      [1913 Webster]

            Evil communications corrupt good manners. --1 Cor.
                                                  xv. 33.
      [1913 Webster]

   4. Means of communicating; means of passing from place to
      place; a connecting passage; connection.
      [1913 Webster]

            The Euxine Sea is conveniently situated for trade,
            by the communication it has both with Asia and
            Europe.                               --Arbuthnot.
      [1913 Webster]

   5. That which is communicated or imparted; intelligence;
      news; a verbal or written message.
      [1913 Webster]

   6. Participation in the Lord's supper. --Bp. Pearson.
      [1913 Webster]

   7. (Rhet.) A trope, by which a speaker assumes that his
      hearer is a partner in his sentiments, and says we,
      instead of I or you. --Beattie.

   Syn: Correspondence; conference; intercourse.
        [1913 Webster]

WordNet (r) 3.0 (2006):

communication
    n 1: the activity of communicating; the activity of conveying
         information; "they could not act without official
         communication from Moscow" [syn: communication,
         communicating]
    2: something that is communicated by or to or between people or
       groups
    3: a connection allowing access between persons or places; "how
       many lines of communication can there be among four people?";
       "a secret passageway provided communication between the two
       rooms"

Moby Thesaurus II by Grady Ward, 1.0:

240 Moby Thesaurus words for "communication":
   access, accommodation, accordance, account, acknowledgment,
   acquaintance, advice, agglomeration, agglutination, aggregation,
   aisle, alley, ambulatory, announcement, answer, aperture, arcade,
   artery, articulation, avenue, award, awarding, bestowal,
   bestowment, billet, blue book, bond, bracketing, briefing,
   bulletin, business letter, channel, chit, cloister, clustering,
   collegiality, colloquial discourse, colloquy, colonnade,
   combination, commerce, communion, communique, community,
   concatenation, concession, concourse, concurrence, conduction,
   conduit, conferment, conferral, confluence, congeries,
   conglomeration, congress, conjugation, conjunction, connection,
   contagion, contribution, convection, convergence, conversation,
   converse, conversing, copulation, corridor, coupling, covered way,
   data, datum, defile, deliverance, delivery, deportation,
   diapedesis, diffusion, directory, discourse, dispatch,
   dissemination, donation, embassy, endowment, enlightenment,
   epistle, evidence, exchange, exit, export, exportation, express,
   expulsion, extradition, facts, factual information,
   familiarization, favor, fellowship, ferry, ford, furnishment,
   gallery, gathering, gen, general information, gifting,
   give-and-take, giving, grant, granting, guidebook, handout,
   hard information, hookup, impartation, impartment, import,
   importation, incidental information, info, information, inlet,
   instruction, intelligence, interchange, intercommunication,
   intercommunion, intercourse, interlinking, interlocution,
   intersection, investiture, joinder, joining, jointure, junction,
   knotting, knowledge, lane, letter, liaison, liberality, light,
   line, linkage, linking, marriage, meeting, mention, merger,
   merging, message, metastasis, metathesis, metempsychosis,
   migration, missive, mutual transfer, note, notice, notification,
   offer, opening, osmosis, outlet, overpass, pairing, pass, passage,
   passageway, passing over, perfusion, pneumatogram, portico,
   presentation, presentment, promotional material, proof, provision,
   publication, publicity, railroad tunnel, rapping, release, reply,
   report, rescript, sidelight, social activity, social intercourse,
   social relations, splice, spread, spreading, statement,
   subscription, supplying, surrender, symbiosis, telegram, the dope,
   the goods, the know, the scoop, tie, tie-in, tie-up, traject,
   trajet, transduction, transfer, transfer of property, transference,
   transfusion, transit, transition, translation, translocation,
   transmigration, transmigration of souls, transmission, transmittal,
   transmittance, transplacement, transplantation, transposal,
   transposition, travel, tunnel, underpass, unification, union,
   verbal intercourse, vouchsafement, white book, white paper, word,
   yoking



Bouvier's Law Dictionary, Revised 6th Ed (1856):

COMMUNICATION, contracts. Information; consultation; conference.
     2. In order to make a contract, it is essential there should be an
agreement; a bare communication or conference will not, therefore, amount to
a contract; nor can evidence of such communication be received in order to
take from, contradict, or alter a written agreement. 1 Dall. 426; 4 Dall.
340; 3 Serg. & Rawle, 609. Vide Pour-parler; Wharton's Dig. Evid. R.