Source : Webster's Revised Unabridged Dictionary (1913)

Disagreement \Dis`a*gree"ment\, n. [Cf. F. d['e]sagr['e]ment
   disagreeable circumstance, disagreeableness.]
   1. The state of disagreeing; a being at variance;
      dissimilitude; diversity.

   2. Unsuitableness; unadaptedness. [R.]

   3. Difference of opinion or sentiment.

   4. A falling out, or controversy; difference.

   Syn: Difference; diversity; dissimilitude; unlikeness;
        discrepancy; variance; dissent; misunderstanding;
        dissension; division; dispute; jar; wrangle; discord.

Source : WordNet®

disagreement
     n 1: a conflict of people's opinions or actions or characters
          [syn: {dissension}, {dissonance}] [ant: {agreement}]
     2: a difference between conflicting facts or claims or
        opinions; "a growing divergence of opinion" [syn: {discrepancy},
         {divergence}, {variance}]
     3: the speech act of disagreeing or arguing or disputing [ant:
        {agreement}]