I am rather surprised that you expect clarity from a professional philosopher. Muddled concepts and definitions are nowhere more at home than among philosophers who are not mathematicians... Just look around at today's philosophers, Schelling, Hegel, Nees von Esenbeck and Co. Don't their definitions make your hair stand on end? Or, in classical philosophy, read the kinds of things which "stars" like Plato and others (I except Aristotle) gave as explanations. Even Kant is often not much better: his distinction between analytic and syntetic propositions is, I believe, one of those which either turns on a triviality or is false.

C.F. Gauss, From a letter to the astronomer Schumacher, November 1, 1844