noun (n)

• a period of time equal to 1/24th of a day(noun.time)

  Example:
  The job will take more than an hour.
  

  Synonym:
  60 minutes, hr
  

  source: wordnet30
• clock time(noun.time)

  Example:
  The hour is getting late.
  

  Synonym:
  time of day
  

  source: wordnet30
• a special and memorable period(noun.time)

  Example:
  It was their finest hour.
  

  source: wordnet30
• distance measured by the time taken to cover it(noun.attribute)

  Example:
  We live an hour from the airport.
  

  Synonym:
  minute
  

  source: wordnet30
• The twenty-fourth part of a day; sixty minutes.(noun)

  source: webster1913