(idiomatic, euphemistic) To satisfy a bodily urge to urinate or defecate.

plural of crime against nature

(psychology) A disputed class of behavioural problems in modern children, ascribed to the fact that they spend little time outdoors.

plural of natural science

An approach to spirituality that is devoid of supernatural elements.

(category theory) A morphism between a pair of parallel functors such that if each object of the shared domain category subtends a correlated arrow — called a component — in the shared codomain (which arrow represents the difference between applying the second functor and the first functor to the correlated object) then each arrow of the shared domain subtends a commuting square — called a naturality square — between two components (correlated to the domain and codomain of the arrow).

A worldview that reveres nature, without belief in the supernatural.

An organic fiber that is obtained naturally, notably from a plant or animal.

An area of land that is managed in order to conserve wildlife or plant habitat or other natural features.

An area of land managed to conserve wildlife or plant habitat or other natural features.