The Collaborative International Dictionary of English v.0.48:

Concur \Con*cur"\, v. i. [imp. & p. p. Concurred; p. pr. & vb.
   n. Concurring.] [L. concurrere to run together, agree; con-
   + currere to run. See Current.]
   1. To run together; to meet. [Obs.]
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            Anon they fierce encountering both concurred
            With grisly looks and faces like their fates. --J.
                                                  Hughes.
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   2. To meet in the same point; to combine or conjoin; to
      contribute or help toward a common object or effect.
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            When outward causes concur.           --Jer. Colier.
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   3. To unite or agree (in action or opinion); to join; to act
      jointly; to agree; to coincide; to correspond.
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            Mr. Burke concurred with Lord Chatham in opinion.
                                                  --Fox.
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            Tories and Whigs had concurred in paying honor to
            Walker.                               --Makaulay.
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            This concurs directly with the letter. --Shak.
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   4. To assent; to consent. [Obs.] --Milton.

   Syn: To agree; unite; combine; conspire; coincide; approve;
        acquiesce; assent.
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The Collaborative International Dictionary of English v.0.48:

Concurring \Con*cur"ring\, a.
   Agreeing.
   [1913 Webster]

   Concurring figure (Geom.), one which, being laid on
      another, exactly meets every part of it, or one which
      corresponds with another in all its parts.
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WordNet (r) 3.0 (2006):

concurring
    adj 1: being of the same opinion [syn: concordant,
           concurring(a)]