noun (n)

• conscientiousness in paying proper attention to a task; giving the degree of care required in a given situation(noun.attribute)

  source: wordnet30
• persevering determination to perform a task(noun.attribute)

  Example:
  His diligence won him quick promotions.
  

  Synonym:
  industriousness, industry
  

  source: wordnet30
• a diligent effort(noun.act)

  Synonym:
  application
  

  source: wordnet30
• The quality of being diligent; carefulness; careful attention; -- the opposite of negligence.(noun)

  source: webster1913
• A four-wheeled public stagecoach, used in France.(noun)

  source: webster1913