Nature, in the broadest sense, is equivalent to the natural world, physical universe, material world or material universe. "Nature" refers to the phenomena of the physical world ...
http://en.wikipedia.org/wiki/Natural

In science, the term natural science refers to a naturalistic approach to the study of the universe, which is understood as obeying rules or law of natural origin.
http://en.wikipedia.org/wiki/Natural_science

Heather Loraine Cosmetics Pure, natural & organic body oils & jojoba butter with Gotu Kola www.heatherloraine.com
http://dictionary.reference.com/search?q=natural

Medicine Man Natural (remedies have been used for centuries - and generations of healers can't be wrong. Can they?) by Edzard Ernst, Herbal eczema cures damage ...
http://www.skepdic.com/natural.html

adjective. of or arising from nature; in accordance with what is found or expected in nature; produced or existing in nature; not artificial or manufactured; dealing with nature as ...
http://www.yourdictionary.com/natural