Any definition of revolution is going to be a working one. Within revolution, we find evolution: the gradual development and diversification of human beings. As humans continue to grow and change, as will this definition.
For now, however, I define revolution as a temporary solution to permanent problems of power. Revolutions only occur if, and only if, there is a drastic shift in the power structure. Whether that means a change in government, a revitalization of an industry, or the creation of groundbreaking product, revolution is not limited to politics because power is not limited politics.
Power surrounds us. Influences us. Creates us.