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Browse key terms and definitions across all GCSE subjects. Search by keyword or filter by subject and exam board.
23,110 key terms
Corrosive
Describes a substance that can attack living tissue, causing chemical burns and serious eye damage.
Corrugated board
Board with a fluted paper layer between liner layers, providing a lightweight structure with stiffness and cushioning.
Corrugated card
Board with a corrugated, or wavy, paper layer between outer sheets, used for lightweight protective packaging.
Corrugated cardboard
Board with a wavy, fluted paper layer between flat outer liners.
Corrugating
Forming a sheet into repeated waves or ridges. In corrugated board, a fluted core is bonded between flat liner sheets.
Corrugation
Forming a sheet into waves or flutes; in corrugated board, this sheet sits between flat outer sheets.
Corrupted
Altered from an original divine form; in discussions of Muslim scripture, this can refer to changes to a text or distortions of its meaning.
Corrupt file
A file whose data has been damaged so that it cannot be processed correctly.
Corruption
The misuse of a position of power for personal benefit, such as officials stealing public money or officers taking supplies intended for soldiers.
Corruption
The misuse of an official position or public funds for private benefit.
Corruption
The misuse of authority for personal advantage, often involving the betrayal of stated principles.
Corruption
Alteration from an original divine revelation, so that a text no longer preserves that revelation accurately.
Corruption Perceptions Index (CPI)
An index ranking countries and territories by perceived public-sector corruption, scored from 0 (highly corrupt) to 100 (very clean).
Corset
A close-fitting undergarment worn to support and shape the body, often drawing in the waist.
Co-rule
Two monarchs sharing a throne. Cleopatra initially ruled jointly with her brother Ptolemy XIII, although they struggled against each other for control.
Co-ruler
A monarch who formally shares rule with another monarch, although their actual political power may be unequal.
Cosine
The ratio of the side adjacent to an angle to the hypotenuse in a right-angled triangle.
Cosine rule
A formula relating all three sides of a triangle to one angle, for example .
Cosmic microwave background (CMB)
Faint microwave radiation detected from all directions in space, understood as radiation left over from the hot early Universe.
Cosmic microwave background (CMB) radiation
Microwave radiation arriving from all directions in space, interpreted as cooled radiation remaining from the hot early Universe.
Cosmic microwave background radiation
Radiation remaining from the early universe, now observed as microwaves, which supports the Big Bang theory.
Cosmic microwave background radiation (CMBR)
Microwave radiation detected from all directions in space, originating in the hot early universe.
Cosmic order
The harmony and right relationship of the whole of creation with God.
Cosmic radiation
High-energy radiation arriving from space, including fast-moving particles from the Sun and beyond.
Cosmic rays
High-energy radiation arriving at Earth from space.
Cosmic reconciliation
The restoration of the whole creation to its intended fulfilment and harmony in Christ, overcoming the damage caused by sin.
Cosmological argument
An argument for God’s existence based on the existence of the universe and the need to explain its origin or dependence. The First Cause argument is a form of cosmological argument.
Cosmology
Beliefs or ideas about the origin, nature and organisation of the universe.
Cost
An expense incurred by a business in producing and selling goods or services.
Cost–benefit analysis
A comparison of an option’s costs with its expected benefits to help decide whether it is worthwhile and how it compares with alternatives.
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