Source : Webster's Revised Unabridged Dictionary (1913)

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.]

            Anon they fierce encountering both concurred With
            grisly looks and faces like their fates. --J.
                                                  Hughes.

   2. To meet in the same point; to combine or conjoin; to
      contribute or help toward a common object or effect.

            When outward causes concur.           --Jer. Colier.

   3. To unite or agree (in action or opinion); to join; to act
      jointly; to agree; to coincide; to correspond.

            Mr. Burke concurred with Lord Chatham in opinion.
                                                  --Fox.

            Tories and Whigs had concurred in paying honor to
            Walker.                               --Makaulay.

            This concurs directly with the letter. --Shak.

   4. To assent; to consent. [Obs.] --Milton.

   Syn: To agree; unite; combine; conspire; coincide; approve;
        acquiesce; assent.

Source : WordNet®

concur
     v 1: be in accord; be in agreement; "We agreed on the terms of
          the settlement"; "I can't agree with you!"; "I hold with
          those who say life is sacred"; "Both philosophers
          concord on this point" [syn: {agree}, {hold}, {concord}]
          [ant: {disagree}]
     2: happen simultaneously; "The two events coincided" [syn: {coincide}]
     [also: {concurring}, {concurred}]

Source : Free On-Line Dictionary of Computing

CONCUR
     
        ["CONCUR, A Language for Continuous Concurrent Processes",
        R.M.  Salter et al, Comp Langs 5(3):163-189 (1981)].