Source : Webster's Revised Unabridged Dictionary (1913)

Disagree \Dis`a*gree"\, v. i. [imp. & p. p. {Disagreed}; p. pr.
   & vb. n. {Disageeing}.] [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.

            They reject the plainest sense of Scripture, because
            it seems to disagree with what they call reason.
                                                  --Atterbury.

   2. To differ in opinion; to hold discordant views; to be at
      controversy; to quarrel.

            Who shall decide, when doctors disagree? --Pope.

   3. To be unsuited; to have unfitness; as, medicine sometimes
      disagrees with the patient; food often disagrees with the
      stomach or the taste.

   Note: Usually followed by with, sometimes by to, rarely by
         from; as, I disagree to your proposal.

   Syn: To differ; vary; dissent.