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.]
      [1913 Webster]

            Anon they fierce encountering both concurred
            With grisly looks and faces like their fates. --J.
                                                  Hughes.
      [1913 Webster]

   2. To meet in the same point; to combine or conjoin; to
      contribute or help toward a common object or effect.
      [1913 Webster]

            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.
      [1913 Webster]

            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.
        [1913 Webster]

WordNet (r) 3.0 (2006):

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, concur, concord]
         [ant: differ, disagree, dissent, take issue]
    2: happen simultaneously; "The two events coincided" [syn:
       concur, coincide]

The Free On-line Dictionary of Computing (19 January 2023):

CONCUR

    A proposal for a language for programming with
   concurrent processes.  CONCUR was inspired by Modula but
   removes Modula's restrictions on the placement of process
   declarations and invocations in order to study the implications of
   process support more fully.  Anderson presents a compiler which
   translates CONCUR into the object language for a hypothetical
   machine.

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

   ["Concur: a High-Level Language for Concurrent Programming",
   Karen Anderson Thesis, B. Thomas Golisano College of Computing and
   Information Sciences, 1979]
   (https://ritdml.rit.edu/handle/1850/15968?show=full)

   (2013-06-05)