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.
      [1913 Webster]

   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.
      [1913 Webster]

            Tories and Whigs had concurred in paying honor to
            Walker.                               --Makaulay.
      [1913 Webster]

            This concurs directly with the letter. --Shak.
      [1913 Webster]

   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]

Moby Thesaurus II by Grady Ward, 1.0:

121 Moby Thesaurus words for "concur":
   accede, accompany, accord, acquiesce, act in concert, act together,
   affiliate, agree, agree in opinion, agree with, ally, amalgamate,
   answer to, assent, associate, assort with, band, band together,
   be consistent, be in cahoots, be in league, be in phase,
   be in time, be of one, be uniform with, check, chime,
   chime in with, close with, club together, coact, coadunate,
   coalesce, coexist, coextend, cohere, coincide, collaborate,
   collude, combine, concert, concord, confederate, conform,
   conform to, conform with, conjoin, connive, consent, consist with,
   consolidate, conspire, contemporize, cooperate, correspond, ditto,
   do business with, dovetail, echo, fall in together, fall in with,
   federate, fit together, fuse, get heads together, get together,
   go along with, go partners, go together, go with, hang together,
   happen together, harmonize, hit, hold together, hook up, interlock,
   intersect, isochronize, jibe, join, join in, join together,
   keep in step, keep pace with, keep together, league,
   league together, lock, make common cause, match, meet, merge,
   overlap, parallel, partner, play ball, pull together,
   put heads together, reciprocate, register, register with,
   respond to, side with, sing in chorus, sort with, square,
   square with, stand together, strike in with, synchronize,
   synergize, tally, team up, throw in together, tie in, tie up, time,
   unite, unite efforts, work together



The Free On-line Dictionary of Computing (30 December 2018):

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)