Key terms & definitions

The number of organisms of one species living in a particular area.

The number of organisms of one species living in a defined area.

The mix of age groups and sexes within a population.

The extent to which a sample represents the target population, allowing findings to be generalised to that population.

The armed wing of the Pan Africanist Congress, which used violent attacks in its attempt to overthrow the apartheid government.

A woman who sold sexual services, typically in a brothel or on the street in ancient Greece. The plural is pornai.

The ability to transfer a program between different computer architectures with little or no change to its source code, provided suitable translation tools are available.

How easily a power source can be carried or moved with a product, without needing a fixed supply connection.

A lightweight camera that can be carried and used more easily on location, including for hand-held filming.

Carrying or dragging boats overland between waterways or around obstacles such as rapids.

A covered porch or walkway supported by columns, which could provide space for royal receptions.

A woman’s marriage fortune: the money she brings to a marriage.

The amount of a food or dish served to one person on one occasion.

Dividing food into pieces suitable for cooking or serving.

The amount of a food served or eaten on one occasion.

The art of making images of particular people, usually showing their appearance and distinguishing features.

The way a person or group is represented through selected details, language and contrasts.

The place a term occupies in a sequence, counted from 1; usually represented by $n$.

The side of a reversible reaction favoured at equilibrium, indicated by the relative amounts of reactants and products.

The relative amounts of reactants and products present in a reaction mixture at equilibrium.

A rule that gives a term directly from its position number, without generating all the earlier terms.

A vector from a fixed origin to a point, describing the point's position relative to that origin.

Measures intended to help a disadvantaged or underrepresented group overcome barriers and access opportunities.

An angle measured by an anticlockwise rotation. In the unit-circle definitions, the rotation starts from the positive $x$-axis.

The state of an object that has lost electrons and therefore has fewer electrons than protons.

A factor that raises the death rate and therefore limits population growth, such as famine, disease or war in Malthus's theory.

A relationship in which one variable generally increases as the other increases.

A positive correlation is a pattern in which two measured quantities tend to increase together.

A relationship in which two measured quantities tend to increase together or decrease together. This alone does not establish that one causes the other.

A relationship in which y generally increases as x increases.