noun (n)

• the act or process of complicating(noun.act)

  source: wordnet30
• a situation or condition that is complex or confused(noun.state)

  Example:
  Her coming was a serious complication.
  

  source: wordnet30
• any disease or disorder that occurs during the course of (or because of) another disease(noun.state)

  Example:
  Bed sores are a common complication in cases of paralysis.
  

  source: wordnet30
• a development that complicates a situation(noun.event)

  Synonym:
  ramification
  

  source: wordnet30
• puzzling complexity(noun.attribute)

  Synonym:
  complicatedness, knottiness, tortuousness
  

  source: wordnet30
• The act or process of complicating; the state of being complicated; intricate or confused relation of parts; entanglement; complexity.(noun)

  source: webster1913