Definition of Capitalism

Make an overview of what defining features/properties/characteristics/qualities defines the idea/system of capitalism. 
* Free markets
* Private property
* Enforcement of property rights/rule of law
* Freedom of enterprise
* etc ???
Inspired by reading Book: The Worldly Philosophers, and seeing communism/capitalism defined as the existence or absence of private property. Got me asking: before first industrial capitalism, was there really a lesser degree of private property? My intuition was that there was a lesser degree of markets, not property rights.