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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
Ceramic
A hard, usually brittle, non-metallic material made by heating substances such as clay or sand; examples include bricks, porcelain and glass.
Cerebellum
The region at the back of the brain that coordinates muscle movement and helps maintain balance.
Cerebellum
A brain structure that coordinates movement and helps maintain balance and posture.
Cerebral cortex
The highly folded outer layer of the cerebrum, involved in conscious thought, memory, language and intelligence.
Cerebral cortex
The thin outer layer of the brain’s cerebral hemispheres, containing specialised areas involved in functions such as movement, sensation and language.
Cerebral hemispheres
The two large, folded halves at the top and front of the brain that control conscious thought, memory, language, sensory awareness and voluntary movement.
Cerebrum
The large, upper part of the brain responsible for higher-order processes including conscious thought, intelligence, memory and personality.
Cerebrum
The main upper part of the brain, containing lobes involved in functions such as thinking, processing sensory information and memory.
Certain
An event that is guaranteed to happen; its probability is 1.
Certain event
An event that must happen; its probability is 1, or 100%.
Cervical cancer
A non-communicable disease in which cells of the cervix grow and divide uncontrollably.
Cervical cancer
A non-communicable disease in which abnormal cells in the cervix divide uncontrollably.
Cesspit
A pit used to collect sewage and other waste.
CGI
Computer-generated imagery: images created or enhanced using computer software.
CGI
Computer-generated imagery: digitally created images integrated into a film, including creatures, vehicles and environments.
Chain-based index number
An index comparing a value in one period with its value in the immediately preceding period, which acts as the reference value of 100.
Chain base index number
An index comparing a value with the value in the immediately preceding period, rather than with a fixed base period.
Chain of command
The system through which military orders pass from senior commanders to the officers and troops who carry them out.
Chain of command
The formal line of authority through an organisation, showing who reports to whom.
Chain of evacuation
The organised system for treating and moving wounded soldiers from the front line to progressively better-equipped medical facilities.
Chain reaction
A sequence of fission reactions in which neutrons released by one fission cause further nuclei to split.
Chain store
A shop belonging to a business that operates shops in several locations.
Chalice
The cup used to hold wine which is consecrated as Christ’s blood during the Eucharist.
Challah
Bread traditionally eaten at Shabbat and festival meals; two loaves are used at the Shabbat table.
Chamber tomb
A burial room cut into a hillside, commonly reused for successive burials.
Chametz
Leavened food made from certain grains, removed from the home and not eaten during Pesach.
Chamfer
A sloping face made by removing the corner between two surfaces.
Chanani
The canopy above the Guru Granth Sahib, used as a sign of honour and reverence.
Chance
An unpredictable or accidental occurrence, which need not be part of a predetermined plan.
Chancellor
A royal official who headed the chancery, which produced royal documents and used the king’s Great Seal to authenticate them.
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