noun (n)

• a bold challenge(noun.communication)

  source: wordnet30
• discord resulting from a clash of ideas or opinions(noun.communication)

  source: wordnet30
• a hostile disagreement face-to-face(noun.communication)

  Synonym:
  encounter, face-off, showdown
  

  source: wordnet30
• the act of hostile groups opposing each other(noun.act)

  Example:
  The government was not ready for a confrontation with the unions.
  

  Synonym:
  opposition
  

  source: wordnet30
• a focussed comparison; bringing together for a careful comparison(noun.act)

  source: wordnet30
• Act of confronting.(noun)

  source: webster1913