noun (n)

• an act that fails(noun.act)

  Example:
  His failure to pass the test.
  

  source: wordnet30
• an event that does not accomplish its intended purpose(noun.event)

  Example:
  The surprise party was a complete failure.
  

  Antonym:
  success
  

  source: wordnet30
• lack of success(noun.state)

  Example:
  He felt that his entire life had been a failure.
  That year there was a crop failure.
  

  source: wordnet30
• a person with a record of failing; someone who loses consistently(noun.person)

  Synonym:
  loser, nonstarter, unsuccessful person
  Antonym:
  achiever, succeeder, success, winner
  

  source: wordnet30
• an unexpected omission(noun.act)

  Example:
  He resented my failure to return his call.
  The mechanic's failure to check the brakes.
  

  source: wordnet30
• inability to discharge all your debts as they come due(noun.state)

  Example:
  Fraudulent loans led to the failure of many banks.
  

  Synonym:
  bankruptcy
  

  source: wordnet30
• loss of ability to function normally(noun.state)

  Example:
  Kidney failure.
  

  source: wordnet30
• Cessation of supply, or total defect; a failing; deficiency; as, failure of rain; failure of crops.(noun)

  source: webster1913