The Collaborative International Dictionary of English v.0.48:

Confluence \Con"flu*ence\, n. [L. confluentia.]
   1. The act of flowing together; the meeting or junction of
      two or more streams; the place of meeting.
      [1913 Webster]

            New York stood at the confluence of two rivers.
                                                  --Bancroft.
      [1913 Webster]

   2. Any running together of separate streams or currents; the
      act of meeting and crowding in a place; hence, a crowd; a
      concourse; an assemblage.
      [1913 Webster]

            You see this confluence, this great flood of
            vistors.                              --Shak.
      [1913 Webster]

            The confluence . . . of all true joys. --Boyle.
      [1913 Webster]

U.S. Gazetteer (1990):

Confluence, KY
  Zip code(s): 41730
Confluence, PA (borough, FIPS 15680)
  Location: 39.80948 N, 79.35434 W
  Population (1990): 873 (413 housing units)
  Area: 4.2 sq km (land), 0.1 sq km (water)

Moby Thesaurus II by Grady Ward, 1.0:

146 Moby Thesaurus words for "confluence":
   accompaniment, accordance, affluence, afflux, affluxion,
   agglomeration, agglutination, aggregation, agreement, alliance,
   approach, articulation, assemblage, assembly, association,
   asymptote, bond, bottleneck, bracketing, cahoots, call-up, canvass,
   census, clustering, co-working, coaction, coincidence,
   collaboration, collection, collectivity, colligation,
   collision course, collocation, collusion, combination,
   combined effort, communication, comparison, concatenation,
   concentralization, concentration, concert, concerted action,
   concomitance, concordance, concourse, concurrence, conflux,
   congeries, conglomeration, congregation, congress, conjugation,
   conjunction, connection, consilience, conspiracy, convergence,
   converging, cooperation, copulation, corralling, correspondence,
   coupling, course, crosscurrent, crossing, current, data-gathering,
   defluxion, downflow, downpour, drift, driftage, flow, flowing,
   fluency, flux, focalization, focus, funnel, gathering, gush,
   hookup, hub, inflow, ingathering, intercommunication, intercourse,
   interlinking, inventory, joinder, joining, jointure, junction,
   juxtaposition, knotting, liaison, linkage, linking, marriage,
   meeting, merger, merging, mill run, millrace, mobilization, muster,
   mutual approach, narrowing gap, onrush, onward course, outflow,
   pairing, parasitism, race, radius, rodeo, roundup, run, rush,
   saprophytism, set, simultaneity, spate, splice, spokes, stream,
   surge, survey, symbiosis, synchronism, synergy, tangent, tide, tie,
   tie-in, tie-up, trend, undercurrent, undertow, unification, union,
   united action, water flow, yoking