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
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.
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.