From the Wikipedia:
"A revolutionary wave or revolutionary decade is one series of revolutions occurring in various locations within a similar time-span. In many cases, past revolutions and revolutionary waves have inspired current ones, or an initial revolution has inspired other concurrent "affiliate revolutions" with similar aims.The causes of revolutionary waves have become the subjects of study by historians and political philosophers, including Robert Roswell Palmer, Crane Brinton, Hannah Arendt, Eric Hoffer, and Jacques Godechot.
Marxists see revolutionary waves as evidence that a world revolution is possible. For Rosa Luxemburg, "The most precious thing… in the sharp ebb and flow of the revolutionary waves is the proletariat's spiritual growth. The advance, by leaps and bounds, of the intellectual stature of the proletariat affords an inviolable guarantee of its further progress in the inevitable economic and political struggles ahead."
Non-Marxist writers and activists, including Justin Raimondo and Michael Lind, have used the phrase "revolutionary wave" to describe discrete revolutions happening within a short time-span."