Definition: The system of all phenomena in space and time; the totality of physical reality. It is both a scientific and philosophic concept appearing in all historic eras. (Webster 2d; Dr. James H. Cassedy, NLM History of Medicine Division)
restrict to Nature as an abstract or philosophical concept, as "von Humboldt's Views of Nature" or "the laws of nature"; not for "the nature of science" or "the nature of psychoanalytic theory"
