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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
Peer review
The checking of scientific findings by other scientists, who assess whether the methods, evidence and conclusions are sound.
Peer review
The checking of scientific research by other scientists with relevant expertise, including its methods, results and conclusions.
Peer-reviewed journal
A publication containing research articles that have been assessed by relevant experts before acceptance.
Peer selection
Choosing friends who already share one's attitudes or behaviour, rather than becoming similar because of their influence.
Peer-to-peer network
A network arrangement in which computers share resources directly without a dedicated central server; each peer can request and provide resources.
PEGI
Pan European Game Information: a system that classifies video games by age suitability and provides information about their content and interactive risks.
Peisistratids
Peisistratus and his ruling family at Athens, including his sons Hippias and Hipparchus.
Peloponnesian League
The alliance led by Sparta, whose members included Corinth and, at different points, Megara.
Pelt
An animal’s skin with its fur still attached, traded for use in products such as hats.
Peltast
A lightly armed infantry soldier equipped with javelins and a lighter shield, able to attack and withdraw more readily than a hoplite.
Pelvis
The bony structure at the hips, where the femur meets the skeleton of the trunk.
Penal colony
An overseas settlement used to hold and employ transported convicts.
Penal Laws
Laws restricting religious groups outside the established church. In Ireland after the Williamite War, they reinforced Anglican dominance by restricting Catholics’ access to public life and land; some restrictions also affected Protestant Dissenters.
Penal reform
Changes to the laws and institutions used to punish offenders, such as reducing death sentences or improving prisons.
Penal servitude
A punishment involving imprisonment and compulsory labour.
Penal settlement
A place where convicted prisoners are sent to live and work as punishment, often far from their homes. Small is imprisoned in the British penal settlement in the Andaman Islands.
Penal substitution
The understanding of Jesus’ death as taking the punishment for human sin on humanity’s behalf.
Penal transportation
A punishment in which a convicted person was sent overseas to a penal colony, often to perform forced labour.
Penance
An act performed to show repentance and make amends for sin, such as prayer or giving money to the Church.
Penance
An act or punishment undertaken for wrongdoing or sin.
Penance
An action expressing repentance for wrongdoing and a desire to turn back towards God.
Penetrating ability
A radiation's ability to travel through matter before being absorbed or losing enough energy to stop.
Penetrating finish
A finish that soaks into the surface fibres of timber rather than mainly forming a coating on top, such as a penetrating oil.
Penetrating power
The ability of radiation to pass through a material.
Penetration
How readily radiation passes through a material before being absorbed.
Penetration pricing
Setting a low initial price for a new product to attract customers and build market share.
Penetration testing
A controlled, authorised attempt to gain access to computer resources without the normal means of access, used to identify security vulnerabilities.
Penicillin
An antibiotic discovered by Alexander Fleming in 1928 after he observed that a mould prevented nearby bacteria from growing.
Penitence
Sincere regret for wrongdoing, accompanied by a desire to change.
Penitential Act
The part of the introductory rites of Mass in which the congregation acknowledges its sins and asks for God’s mercy.
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