Definitions of failure:

• noun:   an unexpected omission

  Example: "He resented my failure to return his call"

• noun:   an act that fails

  Example: "His failure to pass the test"

• noun:   an event that does not accomplish its intended purpose

  Example: "The surprise party was a complete failure"

• noun:   a person with a record of failing; someone who loses consistently
• noun:   loss of ability to function normally

  Example: "Kidney failure"

• noun:   lack of success

  Example: "He felt that his entire life had been a failure"

• noun:   inability to discharge all your debts as they come due

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