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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]
-natured having or showing (such) a nature, character, or temperament.
nature preserve an area set aside for the protection and propagation of fish, animals, or plant life.
naturist one who appreciates the delights of nature.
naturopathy a method of treating illness without drugs, relying on massage, sunlight, proper food, and the like.
Naugahyde trademark for a strong vinyl-coated fabric imitative of leather, used for furniture, luggage, and the like.
naught the number zero. [2 definitions]
naughty misbehaving or mischievous. [2 definitions]
Nauru a Pacific island country slightly south of the equator and northeast of New Guinea.
nausea a stomach disturbance marked by vomiting or the impulse to vomit; queasiness. [2 definitions]
nauseate to upset the stomach of (a person or animal), often to the point of causing vomiting; cause nausea in. [2 definitions]
nauseous causing nausea; sickening or disgusting. [2 definitions]