n. 1.  a.  The material world and its phenomena: scientists analyzing nature. b.  The forces and processes that produce and control these phenomena: the balance of nature. 2.  The world of living things and the outdoors: spent the day enjoying nature. 3.  A primitive state of existence, untouched and uninfluenced by civilization or social constraints: when people lived in a state of nature. 4.  The basic character or qualities of humanity: It is only human nature to worry about the future. 5.  The fundamental character or disposition of a person; temperament: a man of an irascible nature. See Synonyms at  disposition. 6.  The set of inherent characteristics or properties that distinguish something: trying to determine the nature of a newly discovered phenomenon. 7.  A kind or sort: confidences of a personal nature. 8.  a.  The processes and functions of the body, as in healing: The doctor decided not to do anything and let nature take its course. b.  Heredity: behavior more influenced by nature than nurture. [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 the Appendix of Indo-European roots.]  | 
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