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natural US English

Existing in or caused by nature; not made or caused by humankind

natural US Thesaurus

a natural occurrence

natural gas US English

Flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel

natural law US English

A body of unchanging moral principles regarded as a basis for all human conduct

natural-born US English

Having a specified innate characteristic or ability

natural food US English

Food that has undergone a minimum of processing or treatment with preservatives

natural life US English

The expected span of a person’s life or a thing’s existence under normal circumstances

natural magic US English

(In the Middle Ages) magic practiced for beneficial purposes, involving the making of images, healing, and the use of herbs

natural year US English

The tropical or solar year

natural history US English

The scientific study of animals or plants, especially as concerned with observation rather than experiment, and presented in popular rather than academic form

natural numbers US English

The positive integers (whole numbers) 1, 2, 3, etc., and sometimes zero as well

natural science US English

A branch of science that deals with the physical world, e.g., physics, chemistry, geology, and biology

natural virtue US English

Any of the traditional chief moral virtues, especially the cardinal virtues

natural childbirth US English

Childbirth with minimal medical or technological intervention, usually involving special breathing and relaxation techniques

natural disaster US English

A natural event such as a flood, earthquake, or hurricane that causes great damage or loss of life

natural frequency US English

The frequency at which a system oscillates when not subjected to a continuous or repeated external force

natural language US English

A language that has developed naturally in use (as contrasted with an artificial language or computer code)

natural logarithm US English

A logarithm to the base e (2.71828...)

natural philosophy US English

Natural science, especially physical science

natural religion US English

Religion, especially deism, based on reason rather than divine revelation

natural resources US English

Materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain

natural selection US English

The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution

natural theology US English

Theology or knowledge of God based on observed facts and experience apart from divine revelation

natural classification US English

A scientific classification according to features that are held to be objectively significant, rather than being selected for convenience

natural killer cell US English

A lymphocyte able to bind to certain tumor cells and virus-infected cells without the stimulation of antigens, and kill them by the insertion of granules containing perforin

natural family planning US English

Another term for rhythm method.

Natural History Museum US English

A museum of zoological, botanical, palaeontological, and mineralogical items in South Kensington, London

Area of Outstanding Natural Beauty US English

(In England, Wales, and Northern Ireland) an area of countryside designated by a government agency as having natural features of exceptional beauty and therefore given a protected status

nonnatural US English

Not involving or manifesting natural means or processes

astrology US English

The study of the movements and relative positions of celestial bodies interpreted as having an influence on human affairs and the natural world

natural logarithm in logarithm US English

A quantity representing the power to which a fixed number (the base) must be raised to produce a given number