The Collaborative International Dictionary of English v.0.48:

Disagree \Dis`a*gree"\ (d[i^]s`[.a]*gr[=e]"), v. i. [imp. & p.
   p. Disagreed (d[i^]s`[.a]*gr[=e]d"); p. pr. & vb. n.
   Disagreeing.] [Pref. dis- + agree: cf. F. d['e]sagr['e]er
   to displease.]
   1. To fail to accord; not to agree; to lack harmony; to
      differ; to be unlike; to be at variance.
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            They reject the plainest sense of Scripture, because
            it seems to disagree with what they call reason.
                                                  --Atterbury.
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   2. To differ in opinion; to hold discordant views; to be at
      controversy; to quarrel.
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            Who shall decide, when doctors disagree? --Pope.
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   3. To be unsuited; to have unfitness; as, medicine sometimes
      disagrees with the patient; food often disagrees with the
      stomach or the taste.
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   Note: Usually followed by with, sometimes by to, rarely by
         from; as, I disagree to your proposal.

   Syn: To differ; vary; dissent.
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