Source : Webster's Revised Unabridged Dictionary (1913)

Concern \Con*cern"\, v. t. [imp. & p. p. {Concerned}; p. pr. &
   vb. n. {Concerning}.] [F. concerner, LL. concernere to
   regard, concern, fr. L. concernere to mix or mingle together,
   as in a sieve for separating; con- + cernere to separate,
   sift, distinguish by the senses, and especially by the eyes,
   to perceive, see. See {Certain}.]
   1. To relate or belong to; to have reference to or connection
      with; to affect the interest of; to be of importance to.

            Preaching the kingdom of God, and teaching those
            things which concern the Lord Jesus Christ. --Acts
                                                  xxviii. 31.

            Our wars with France have affected us in our most
            tender interests, and concerned us more than those
            with any other nation.                --Addison.

            It much concerns a preacher first to learn The
            genius of his audience and their turn. --Dodsley.

            Ignorant, so far as the usual instruction is
            concerned.                            --J. F.
                                                  Cooper.

   2. To engage by feeling or sentiment; to interest; as, a good
      prince concerns himself in the happiness of his subjects.

            They think themselves out the reach of Providence,
            and no longer concerned to solicit his favor.
                                                  --Rogers.

Concerned \Con*cerned"\, a. [See {Concern}, v. t., 2.]
   Disturbed; troubled; solicitous; as, to be much concerned for
   the safety of a friend.

Source : WordNet®

concerned
     adj 1: feeling or showing worry or solicitude; "concerned parents
            of youthful offenders"; "was concerned about the
            future"; "we feel concerned about accomplishing the
            task at hand"; "greatly concerned not to disappoint a
            small child" [ant: {unconcerned}]
     2: involved in or affected by or having a claim to or share in;
        "a memorandum to those concerned"; "an enterprise in which
        three men are concerned"; "factors concerned in the rise
        and fall of epidemics"; "the interested parties met to
        discuss the business" [syn: {interested}]
     3: in relation (or in regard) to; especially as in the phrases;
        "as far as x is concerned"; "where x is concerned"
     4: culpably involved; "all those concerned in the bribery case
        have been identified"; "named three officials implicated
        in the plot"; "an innocent person implicated by
        circumstances in a crime" [syn: {implicated}]