The Collaborative International Dictionary of English v.0.48:

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.
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            Preaching the kingdom of God, and teaching those
            things which concern the Lord Jesus Christ. --Acts
                                                  xxviii. 31.
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            Our wars with France have affected us in our most
            tender interests, and concerned us more than those
            with any other nation.                --Addison.
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            It much concerns a preacher first to learn
            The genius of his audience and their turn.
                                                  --Dodsley.
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            Ignorant, so far as the usual instruction is
            concerned.                            --J. F.
                                                  Cooper.
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   2. To engage by feeling or sentiment; to interest; as, a good
      prince concerns himself in the happiness of his subjects.
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            They think themselves out the reach of Providence,
            and no longer concerned to solicit his favor.
                                                  --Rogers.
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The Collaborative International Dictionary of English v.0.48:

Concerning \Con*cern"ing\, prep.
   Pertaining to; regarding; having relation to; respecting; as
   regards.
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         I have accepted thee concerning this thing. --Gen. xix.
                                                  21.
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         The Lord hath spoken good concerning Israel. --Num. x.
                                                  29.
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The Collaborative International Dictionary of English v.0.48:

Concerning \Con*cern"ing\, a.
   Important. [Archaic]
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         So great and so concerning truth.        --South.
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The Collaborative International Dictionary of English v.0.48:

Concerning \Con*cern"ing\, n.
   1. That in which one is concerned or interested; concern;
      affair; interest. "Our everlasting concernments." --I.
      Watts.
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            To mix with thy concernments I desist. --Milton.
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   2. Importance; moment; consequence.
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            Let every action of concernment to begun with
            prayer.                               --Jer. Taylor.
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   3. Concern; participation; interposition.
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            He married a daughter to the earl without any other
            approbation of her father or concernment in it, than
            suffering him and her come into his presence.
                                                  --Clarendon.
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   4. Emotion of mind; solicitude; anxiety.
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            While they are so eager to destroy the fame of
            others, their ambition is manifest in their
            concernment.                          --Dryden.
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Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "concerning":
   about, against, anent, apropos of, as for, as regards, as respects,
   as to, in connection with, in point of, in re, in reference to,
   in regard to, in relation to, in relation with, in respect to, of,
   on, pertaining to, pertinent to, re, referring to, regarding,
   relating to, relative to, respecting, speaking of, touching, upon,
   with regard to, with respect to