The Collaborative International Dictionary of English v.0.48:

Concordant \Con*cord"ant\, a. [L. concordans, p. pr. of
   concordare: cf. F. concordant. See Concord.]
   Agreeing; correspondent; harmonious; consonant.
   [1913 Webster]

         Were every one employed in points concordant to their
         natures, professions, and arts, commonwealths would
         rise up of themselves.                   --Sir T.
                                                  Browne
   [1913 Webster]

WordNet (r) 3.0 (2006):

concordant
    adj 1: in keeping; "salaries agreeable with current trends";
           "plans conformable with your wishes"; "expressed views
           concordant with his background" [syn: accordant,
           agreeable, conformable, consonant, concordant]
    2: being of the same opinion [syn: concordant,
       concurring(a)]