Of or pertaining to John Maynard Keynes; conforming to the theories of Keynesianism; -- especially, the term is used to refer to the macroeconomic theories and politico-economic policies proposed by Keynes and his followers, especially in regards to their advocacy of governmental action to maintain low unemployment through government spending. Keynes's book "The General Theory of Employment, Interest, and Money" (Macmillan, 1936) had a strong influence on views of the government's role in the economy through the 1970's.

A believer in the theories of Keynesianism.

Referring to models of the aggregate economy based on ideas stemming from Keynes (1936). Keynesian models depart from neoclassical assumptions primarily by allowing for disequilibrium in labor markets, with aggregate employment and output being determined instead by aggregate demand.