Definition of economy

The noun economy has 4 senses? (first 4 from tagged texts)

(the system of production and distribution and consumption)

(the efficient use of resources; "economy of effort")

(frugality in the expenditure of money or resources; "the Scots are famous for their economy")

(an act of economizing; reduction in cost; "it was a small economy to walk to work every day"; "there was a saving of 50 cents")