noun (n)

• the act of disrupting an established order so it fails to continue(noun.act)

  Example:
  His warning came after the breakdown of talks in London.
  

  Synonym:
  dislocation
  

  source: wordnet30
• a mental or physical breakdown(noun.state)

  Synonym:
  crack-up
  

  source: wordnet30
• a cessation of normal operation(noun.event)

  Example:
  There was a power breakdown.
  

  Synonym:
  equipment failure
  

  source: wordnet30
• an analysis into mutually exclusive categories(noun.cognition)

  Synonym:
  partitioning
  

  source: wordnet30
• The act or result of breaking down, as of a carriage; downfall.(noun)

  source: webster1913