The Collaborative International Dictionary of English v.0.48:

Differ \Dif"fer\, v. t.
   To cause to be different or unlike; to set at variance. [R.]
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         But something 'ts that differs thee and me. --Cowley.
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The Collaborative International Dictionary of English v.0.48:

Differ \Dif"fer\, v. i. [imp. & p. p. Differed; p. pr. & vb.
   n. Differing.] [L. differre; dif- = dis- + ferre to bear,
   carry: cf. F. diff['e]rer. See 1st Bear, and cf. Defer,
   Delay.]
   1. To be or stand apart; to disagree; to be unlike; to be
      distinguished; -- with from.
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            One star differeth from another star in glory. --1
                                                  Cor. xv. 41.
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            Minds differ, as rivers differ.       --Macaulay.
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   2. To be of unlike or opposite opinion; to disagree in
      sentiment; -- often with from or with.
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   3. To have a difference, cause of variance, or quarrel; to
      dispute; to contend.
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            We 'll never differ with a crowded pit. --Rowe.

   Syn: To vary; disagree; dissent; dispute; contend; oppose;
        wrangle.

   Usage: -- To Differ with, Differ from. Both differ from
          and differ with are used in reference to opinions; as,
          "I differ from you or with you in that opinion." In
          all other cases, expressing simple unlikeness, differ
          from is used; as, these two persons or things differ
          entirely from each other.
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                Severely punished, not for differing from us in
                opinion, but for committing a nuisance.
                                                  --Macaulay.
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                Davidson, whom on a former occasion we quoted,
                to differ from him.               --M. Arnold.
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                Much as I differ from him concerning an
                essential part of the historic basis of
                religion.                         --Gladstone.
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                I differ with the honorable gentleman on that
                point.                            --Brougham.
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                If the honorable gentleman differs with me on
                that subject, I differ as heartily with him, and
                shall always rejoice to differ.   --Canning.
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WordNet (r) 3.0 (2006):

differ
    v 1: be different; "These two tests differ in only one respect"
         [ant: be, equal]
    2: be of different opinions; "I beg to differ!"; "She disagrees
       with her husband on many questions" [syn: disagree,
       differ, dissent, take issue] [ant: agree, concord,
       concur, hold]