noun (n)

• a conflict of people's opinions or actions or characters(noun.state)

  Synonym:
  dissension, dissonance
  Antonym:
  accord, agreement
  

  source: wordnet30
• a difference between conflicting facts or claims or opinions(noun.attribute)

  Synonym:
  discrepancy, divergence, variance
  

  source: wordnet30
• the speech act of disagreeing or arguing or disputing(noun.communication)

  Antonym:
  agreement
  

  source: wordnet30
• The state of disagreeing; a being at variance; dissimilitude; diversity.(noun)

  source: webster1913