The Collaborative International Dictionary of English v.0.48:

Concurrence \Con*cur"rence\, n. [F., competition, equality of
   rights, fr. LL. concurrentia competition.]
   1. The act of concurring; a meeting or coming together;
      union; conjunction; combination.
      [1913 Webster]

            We have no other measure but our own ideas, with the
            concurence of other probable reasons, to persuade
            us.                                   --Locke.
      [1913 Webster]

   2. A meeting of minds; agreement in opinion; union in design
      or act; -- implying joint approbation.
      [1913 Webster]

            Tarquin the Proud was expelled by the universal
            concurrence of nobles and people.     --Swift.
      [1913 Webster]

   3. Agreement or consent, implying aid or contribution of
      power or influence; cooperation.
      [1913 Webster]

            We collect the greatness of the work, and the
            necessity of the divine concurrence to it. --Rogers.
      [1913 Webster]

            An instinct that works us to its own purposes
            without our concurrence.              --Burke.
      [1913 Webster]

   4. A common right; coincidence of equal powers; as, a
      concurrence of jurisdiction in two different courts.
      [1913 Webster]

WordNet (r) 3.0 (2006):

concurrence
    n 1: agreement of results or opinions [syn: concurrence,
         concurrency]
    2: acting together, as agents or circumstances or events [syn:
       concurrence, concurrency]
    3: a state of cooperation [syn: concurrence, meeting of
       minds]
    4: the temporal property of two things happening at the same
       time; "the interval determining the coincidence gate is
       adjustable" [syn: concurrence, coincidence,
       conjunction, co-occurrence]