The Collaborative International Dictionary of English v.0.48:

Concourse \Con"course\, n. [F. concours, L. concursus, fr.
   concurrere to run together. See Concur.]
   1. A moving, flowing, or running together; confluence.
      [1913 Webster]

            The good frame of the universe was not the product
            of chance or fortuitous concourse of particles of
            matter.                               --Sir M. Hale.
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   2. An assembly; a gathering formed by a voluntary or
      spontaneous moving and meeting in one place.
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            Amidst the concourse were to be seen the noble
            ladies of Milan, in gay, fantastic cars, shining in
            silk brocade.                         --Prescott.
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   3. The place or point of meeting or junction of two bodies.
      [Obs.]
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            The drop will begin to move toward the concourse of
            the glasses.                          --Sir I.
                                                  Newton.
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   4. An open space where several roads or paths meet; esp. an
      open space in a park where several roads meet.
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   5. Concurrence; cooperation. [Obs.]
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            The divine providence is wont to afford its
            concourse to such proceeding.         --Barrow.
      [1913 Webster]

WordNet (r) 3.0 (2006):

concourse
    n 1: a large gathering of people [syn: multitude, throng,
         concourse]
    2: a wide hallway in a building where people can walk
    3: a coming together of people [syn: concourse, confluence]

Moby Thesaurus II by Grady Ward, 1.0:

189 Moby Thesaurus words for "concourse":
   accompaniment, accordance, affluence, afflux, affluxion,
   agglomeration, agglutination, aggregation, agreement, alliance,
   approach, articulation, assemblage, assemblee, assembly,
   assignation, association, asymptote, at home, ball, bond,
   bottleneck, bracketing, brawl, cahoots, call-up, canvass, caucus,
   census, clustering, co-working, coaction, coincidence,
   collaboration, collection, collectivity, colligation,
   collision course, collocation, colloquium, collusion, combination,
   combined effort, commission, committee, communication, comparison,
   concatenation, concentralization, concentration, concert,
   concerted action, conclave, concomitance, concordance, concurrence,
   confluence, conflux, congeries, conglomeration, congregation,
   congress, conjugation, conjunction, connection, consilience,
   conspiracy, conventicle, convention, convergence, converging,
   convocation, cooperation, copulation, corralling, correspondence,
   council, coupling, course, crosscurrent, crossing, current, dance,
   data-gathering, date, defluxion, diet, downflow, downpour, drift,
   driftage, eisteddfod, festivity, fete, flow, flowing, fluency,
   flux, focalization, focus, forgathering, forum, funnel, gathering,
   get-together, gush, hookup, housewarming, hub, inflow, ingathering,
   intercommunication, intercourse, interlinking, inventory, joinder,
   joining, jointure, junction, juxtaposition, knotting, levee,
   liaison, linkage, linking, marriage, meet, meeting, merger,
   merging, mill run, millrace, mobilization, muster, mutual approach,
   narrowing gap, onrush, onward course, outflow, pairing, panel,
   parasitism, party, plenum, prom, quorum, race, radius, rally,
   reception, rendezvous, rodeo, roundup, run, rush, saprophytism,
   seance, session, set, shindig, simultaneity, sit-in, sitting,
   soiree, spate, splice, spokes, stream, surge, survey, symbiosis,
   symposium, synchronism, synergy, synod, tangent, tide, tie, tie-in,
   tie-up, trend, turnout, undercurrent, undertow, unification, union,
   united action, water flow, yoking