Key terms & definitions

A condition in which the temperature does not change between the initial and final states of the gas.

A term containing no variable, such as $8$ or $-3$.

Velocity that does not change: the object has constant speed and travels in a straight line.

Motion with unchanging speed and direction.

A condition in which the space occupied by the gas does not change.

A condition in which the space occupied by a gas does not change.

Difficulty passing stools, which may be hard and dry. Too little fluid can contribute to this.

A geographical voting district whose electors choose their parliamentary representatives.

An area whose voters elect a representative to Parliament.

A geographical area whose voters elect one MP to represent them in the House of Commons.

A meeting at which residents can discuss personal or local problems with their MP.

A person who lives in an MP’s constituency.

An elected assembly intended to decide Russia's future constitution and system of government.

The decree issued by Emperor Caracalla in AD 212 which extended Roman citizenship to most free inhabitants of the empire.

A set of fundamental rules defining how a country is governed and how political power is organised.

An authoritative Church document setting out fundamental teaching or principles; Vatican II produced four constitutions.

The rules and principles that organise a state, allocate political power and govern how that power is exercised.

A formal change to the United States Constitution, the country's fundamental framework of government and law.

Campaigning through lawful methods to persuade politicians and the public to support political change.

An established constitutional rule or practice that is regarded as binding politically, although it is not itself a legal rule.

A serious dispute over the rules governing political power and the relationships between institutions of government.

A monarchy in which the ruler’s powers are limited by constitutional rules and representative institutions.

A system in which a monarch is Head of State but exercises powers within constitutional limits rather than personally governing the country.

A condition that limits which mathematical answers are possible in the original situation.

A practical limit or responsibility that affects how a statistical investigation can be designed and carried out.

A limit or restriction affecting a design, such as the available space, budget, time or manufacturing equipment.

A drawing made accurately using specified geometrical instruments, with the working arcs left visible.

The selection and arrangement of a media product’s elements, such as language, images and layout, to communicate meaning.

A textile used in a building or structure, for example to provide reinforcement or another functional building feature.

A boundary where tectonic plates move apart and new crust forms.