thrifty and efficient use of material resources; frugality in expenditure
an instance or means of economizing
The government implemented drastic economies
efficient and sparing use of nonmaterial resources, e.g. effort, language, or motion
the structure of economic life in a country, area, or period; an economic system
a cheaper standard of travel, esp by air, than first class
[Middle English yconomie via French and Latin from Greek oikonomia, from oikos house + nemein to manage]