(a) = natural philosophy, n.; (b) Philosophy = Naturphilosophie, n.; cf. physiophilosophy, n.

The theory that there is an eternal and unchanging law of nature, proceeding from the Absolute, from which all laws governing natural phenomena…

A system that assumes the fundamental identity of spirit and nature; spec. Schelling's metaphysical theory of absolute identity (see identity, n. 1a).