na·ture (nāʹchər)n. 1. The material world and its phenomena. 2. The forces and processes that produce and control all the phenomena of the material world: the laws of nature. 3. The world of living things and the outdoors: the beauties of nature. 4. A primitive state of existence, untouched and uninfluenced by civilization or artificiality: couldn't tolerate city life anymore and went back to nature. 5.Theology. Humankind's natural state as distinguished from the state of grace. 6. A kind or sort: confidences of a personal nature. 7. The essential characteristics and qualities of a person or thing: “She was only strong and sweet and in her nature when she was really deep in trouble” (Gertrude Stein). 8. The fundamental character or disposition of a person; temperament: “Strange natures made a brotherhood of ill” (Percy Bysshe Shelley). 9. The natural or real aspect of a person, place, or thing. See Synonyms at disposition. 10. The processes and functions of the body. [Middle English, essential properties of a thing, from Old French, from Latin nātūra, from nātus, past participle of nāscī, to be born. See genə- in Indo-European Roots.]