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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
Egan’s wheel
A framework for assessing sustainable communities through connected features such as services, transport, the economy, the environment and participation in decisions.
Egestion
The removal of undigested and unabsorbed food from the digestive system as faeces.
Egg foam
A gas-in-liquid foam made by trapping air bubbles in an egg mixture through whisking.
Egg wash
An egg-based coating brushed onto dough or pastry before baking to give a shiny, golden-brown surface.
Egocentricity
Difficulty recognising that another person may see, think or feel differently from oneself. It does not mean selfishness.
Egocentrism
Difficulty understanding a situation from another person's perspective.
Eightfold Path
Eight interconnected practices through which Buddhists develop wisdom, ethical conduct and mental discipline to overcome suffering.
Eight Levels of Charity
Maimonides’ ranking of eight ways of giving charity, considering independence, anonymity, willingness and whether help is offered before being requested. Its highest level helps someone become self-supporting.
Einsatzgruppen
Nazi mobile killing units that carried out mass shootings, particularly of Jews, in occupied Eastern Europe.
Eisphora
A special contribution levied on wealthy Athenians and metics to help pay for war.
Either-way offence
A criminal offence that can be tried in either a magistrates’ court or the Crown Court, depending on its seriousness and the defendant’s choice of trial.
Ejector pin
A pin that pushes a cooled injection-moulded component out of its mould after the mould opens.
Ekphora
The ancient Greek funeral procession that carried the dead person from the home to the burial ground.
Elaborative rehearsal
Processing information by connecting it to meaning rather than simply repeating it, helping it enter long-term memory.
Elapsed time
The time that has passed since the examination began.
Elastic behaviour
The property of returning to the original shape and length after the deforming forces are removed.
Elastic collision
A collision in which total kinetic energy as well as total momentum is conserved. Real collisions are usually only approximately elastic.
Elastic deformation
Deformation in which an object returns to its original shape and size when the forces are removed.
Elastic deformation
A change in shape that is reversed when the deforming forces are removed: the object returns to its original shape and length.
Elastic distortion
A change in shape that disappears when the force is removed, so the object returns to its original shape.
Elastic distortion
A reversible change of shape: the object returns to its original shape when the deforming forces are removed.
Elasticity
The ability of a material to return to its original shape after being stretched.
Elasticity
The ability to return to the original shape after a deforming force is removed.
Elastic limit
The greatest load for which an object still returns to its original dimensions when the load is removed.
Elastic limit
The limit beyond which deformation becomes permanent: the object no longer returns fully to its original shape when unloaded.
Elastic object
An object that can return to its original shape and size after the deforming forces are removed, provided it has not been deformed too far.
Elastic potential energy
Energy stored when an elastic object is stretched or compressed.
Elastic potential energy
Energy stored in an elastic object because it has been stretched or compressed, measured in joules (J).
Elastic potential energy store
The energy stored when an object is elastically stretched, compressed or bent.
Elastic potential energy store
Energy stored in an object when it is stretched or compressed.
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