(music) A musical grammar which arises spontaneously in a musical culture (as opposed to an artificial grammar).

A male biological child, whether legitimate or illegitimate, as opposed to one adopted. / An illegitimate son.

(evolutionary theory) A process by which heritable traits conferring survival and reproductive advantage to individuals, or related individuals, tend to be passed on to succeeding generations and become more frequent in a population, whereas other less favourable traits tend to become eliminated; the differential survival and reproduction of phenotypes.

(idiomatic) A mindset, skill, or type of behavior so ingrained through habit or practice that it seems natural, automatic, or without a basis in conscious thought.

The fundamental set of qualities, and the range of behaviour, shared by all humans.

Any source of wealth that occurs naturally, especially minerals, fossil fuels, timber, etc.

Any science involved in studying phenomena or laws of the physical world: physics, chemistry, biology, astronomy, and so on.

An image depicting inanimate objects; a still life.

Turning away from urban environs and attitudes, towards an organic, agrarian lifestyle.

Any natural phenomenon that causes great damage and loss of life. / The emergency situation that is the consequence of such an event.