Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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natural childbirth childbirth without anesthesia or surgical aid, for which the expectant mother often receives lengthy psychological and physical preparation.
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.
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]
natural number any positive integer.
natural philosophy see natural science. [2 definitions]
natural resource a source of wealth and edification that occurs in 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).
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.