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natty (informal) neat, well-groomed, and smartly dressed; dapper.
natural of, pertaining to, produced by, or existing in nature. [9 definitions]
natural-born citizen a person born in the United States or on foreign soil to two parents who are American citizens. Being a natural-born citizen is a requirement for becoming a U.S. president.
natural childbirth childbirth undergone without anesthesia or surgical aid, in preparation for which the expectant mother has often received instruction in the management of pain through breathing and relaxation exercises.
natural disaster a disaster, such as an earthquake, flood, or volcanic eruption, that is caused by natural rather than human forces and which destroys life and property.
natural gas a mixture of hydrocarbon gases occurring naturally in the earth's crust, usu. with petroleum deposits, that is used chiefly for fuel.
natural history the study of botany, zoology, geology, and other sciences that deal with objects in nature or the physical world.
naturalism in literature, a method of depicting life that reflects a philosophy of determinism. [3 definitions]
naturalist a person who has expertise in or is devoted to the study of the natural sciences, esp. botany and zoology. [2 definitions]
naturalistic exhibiting or pertaining to naturalism. [2 definitions]
naturalization the act, on the part of a government, of granting full citizenship to a foreign-born person. [2 definitions]
naturalize to confer citizenship on. [4 definitions]
natural law a law or body of laws considered to be inherent in nature, right reason, or religion, and believed to be morally binding on human actions. [2 definitions]
naturally in accordance with nature and not through a man-made process. [4 definitions]
natural number any positive integer or zero.
natural philosophy see "natural science." [2 definitions]
natural resource a source of economic wealth and prosperity that derives from nature, such as fresh water, mineral deposits, timber, wildlife, and park land.
natural rights basic rights, such as life and liberty, that are considered inherent rights of all human beings.
natural science the branches of science that deal with objective, measurable phenomena as observed in nature, such as biology and chemistry.
natural selection a natural process of evolution in which the organisms that are best adapted to their environment survive and are able to reproduce, while those that are weak leave fewer or no offspring. (See survival of the fittest).
nature the essential character or quality of a person or thing. [9 definitions]