Key terms & definitions

A light-dependent resistor: an electrical component whose resistance decreases as the light intensity reaching it increases.

A light-dependent resistor: a component whose resistance decreases as light intensity increases.

A solution containing dissolved substances that have been washed or released from a solid material.

A solution containing substances dissolved out of a solid material; in bioleaching, it contains dissolved metal compounds.

The washing of dissolved nutrients down through soil by water.

The washing of soluble mineral ions out of soil by water.

The movement of soluble substances out of waste or other material into surrounding soil or water.

The movement of soluble substances, such as water-soluble vitamins, from food into surrounding water.

The personal qualities and decisions through which a commander directs, organises and motivates an army.

The role of directing a group and influencing its decisions; it can depend on trust, practical ability or intimidation.

A question whose wording encourages a particular answer.

A question whose wording suggests or encourages a particular answer.

A question worded to suggest or encourage a particular answer.

The term $ax^2$ in $ax^2+bx+c$; its coefficient is called the leading coefficient.

A zero placed before the first non-zero digit of a number. Leading zeros do not change the value of a positive binary integer.

Digits written before the first non-zero digit to position the decimal point; they do not count as significant figures.

The time between placing an order and receiving it.

The time between placing an order and receiving the material.

A node with no children. In a Huffman tree, each leaf represents a character.

A protective, wax-containing layer covering the outer surface of a leaf's epidermal cells.

The controlled separation and loss of a plant part, such as a leaf.

The alliance of Greek states established by Philip II in 337 BC, through which he obtained authority to wage war against Persia in the name of Greece.

The girls’ branch of the Nazi youth movement, which combined physical activities with preparation for domestic life and motherhood.

The Nazi girls’ organisation, also called the League of German Maidens, which promoted loyalty to Hitler and preparation for motherhood.

The Nazi organisation for girls aged 14–18, also known as the BDM. It promoted Nazi beliefs, physical fitness and preparation for motherhood and domestic responsibilities.

The international organisation created after the First World War to encourage cooperation and resolve disputes peacefully.

A published table comparing schools using measures such as pupils’ examination results.

Published statistical comparisons of schools' performance, including examination and test results.

Money leaving an economy rather than continuing to circulate within it, for example when a TNC sends profits abroad.

An approach to production that reduces wasted materials, time, movement and other resources while maintaining product quality.