noun (n)

• the system of production and distribution and consumption(noun.group)

  Synonym:
  economic system
  

  source: wordnet30
• the efficient use of resources(noun.cognition)

  Example:
  Economy of effort.
  

  source: wordnet30
• frugality in the expenditure of money or resources(noun.attribute)

  Example:
  The Scots are famous for their economy.
  

  Synonym:
  thriftiness
  

  source: wordnet30
• an act of economizing; reduction in cost(noun.act)

  Example:
  It was a small economy to walk to work every day.
  

  Synonym:
  saving
  

  source: wordnet30
• The management of domestic affairs; the regulation and government of household matters; especially as they concern expense or disbursement; as, a careful economy.(noun)

  source: webster1913