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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
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Ersatz
A German term meaning substitute; used for replacement products such as synthetic rubber.
Erythropoietin
A hormone that stimulates red blood cell production. Misusing synthetic EPO can increase the blood’s oxygen-carrying capacity.
Escalade
An assault in which soldiers climb defensive walls using ladders.
Escalation
An increase in the scale or intensity of a conflict, such as committing more troops or expanding bombing.
Escapism
Entertainment that allows people temporarily to forget difficulties in their everyday lives.
Escapism
Using media to divert attention temporarily from everyday routines or worries.
Escapism
A movement away from everyday difficulties into an experience of imagined freedom, pleasure or possibility.
Eschatological belief
Beliefs about death, judgement, the end times and the final destiny of human beings.
Eschatology
Beliefs about the last things, including judgement, resurrection and the final fulfilment of God’s Kingdom.
Espionage
Secretly gathering information about another country, especially its military capabilities or government activities.
Esprit de corps
A sense of loyalty, belonging and shared pride within a group, particularly a military unit.
Essential amino acid
An amino acid that the body cannot make in sufficient amounts and must obtain from food.
Essential criterion
A requirement that a product must meet to solve its design problem successfully.
Essential fatty acid
A fatty acid that the body cannot make and therefore must obtain from food.
Essentialism
A view that males and females have inherent, defining characteristics and behaviours.
Essential nutrient element
A chemical element that an organism needs for growth and healthy functioning.
Established business
A business that has been operating for some time and has a trading history.
Established Church
A church with an official relationship with the state. The Church of England is the established Church in England.
Established church
A church formally linked to the state. The Church of England is established in England, with the monarch as its Supreme Governor.
Establishment
The privileged elite holding influential positions in British government and institutions, often connected through private schooling and Oxford or Cambridge University.
Establishment
A secure domestic and financial position, often gained through marriage. This is the meaning of the word in Charlotte Lucas’s desire for an establishment.
Estate management
The organisation of a household's property, supplies and labour so that its resources are used and preserved effectively.
Esteem
Respect for someone based on a considered judgement of their character and qualities. Austen presents esteem as an important foundation for lasting marital affection.
Ester
A compound formed when a carboxylic acid reacts with an alcohol, producing water as the other product.
Ester bond
The covalent bond formed between glycerol and a fatty acid in a triglyceride.
Ester link
The connection formed when a carboxylic acid group reacts with an alcohol group.
Estimate
A value judged from limited measurements or observations rather than determined exactly.
Estimate
A reasoned approximate value found from suitable known information rather than an exact measurement.
Estimate
A value close enough for the intended purpose, usually found using suitable assumptions and rounded data.
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