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From The Collaborative International Dictionary of English v.0.48:
Keynesianism \Keynesianism\ adj. the macroeconomic theories and politico-economic policies of British economist John Maynard Keynes (1883-1946) and his followers; -- used especially in reference to their advocacy of governmental action to maintain low unemployment through government spending. See Keynes. [WordNet 1.5 +PJC]