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]

WordNet (r) 3.0 (2006):

confluence
    n 1: a place where things merge or flow together (especially
         rivers); "Pittsburgh is located at the confluence of the
         Allegheny and Monongahela rivers" [syn: confluence,
         meeting]
    2: a flowing together [syn: confluence, conflux, merging]
    3: a coming together of people [syn: concourse, confluence]