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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
ANPR
Automatic Number Plate Recognition: technology that reads vehicle registration plates and checks them against records.
Anschluss
The political union of Austria with Germany, achieved by Hitler in March 1938.
Anshan
A kingdom in south-western Iran, ruled by Cyrus and his father Cambyses I, with a mixed Persian and Elamite population.
Antagonist
A character who opposes the central protagonist or obstructs their aims. Jonathan Small is an antagonist in Holmes’s investigation.
Antagonist
The muscle that opposes the agonist’s action. In a simple movement, it relaxes and lengthens to allow the agonist to act.
Antagonist
A character or force that opposes the protagonist.
Antagonistic
Having opposite effects; insulin and glucagon are antagonistic because one lowers blood glucose concentration while the other raises it.
Antagonistic action
The opposing effects of two substances or processes, such as insulin lowering blood glucose concentration and glucagon raising it.
Antagonistic effectors
Two effectors whose actions oppose one another, allowing a controlled variable to be changed in either direction.
Antagonistic muscle action
The coordinated action of opposing muscles: one contracts to produce a movement while the other relaxes. Their roles reverse to produce the opposite movement.
Antagonistic pair
Two muscles or muscle groups that produce opposing movements at a joint.
Antagonistic responses
Responses that have opposing effects, such as mechanisms that increase heat loss and mechanisms that reduce it.
Antam Sanskaar
The Sikh funeral, meaning the last rite of passage.
Antarctic Treaty
An international agreement governing Antarctica that promotes peaceful use, scientific research and cooperation between countries.
Antaryami
The divine understood as the indwelling Lord, present within a person’s heart.
Antecedent
The noun or noun phrase to which a pronoun refers.
Antecedent conditions
Conditions in a drainage basin before a rainfall event, especially how wet the soil already is.
Antenna
A conductor used to transmit or receive radio waves; also called an aerial.
Anterograde amnesia
An inability to form new long-term memories after the onset of an illness or injury.
Anthology
A collection of literary works, often by different writers.
Anthropogenic
Caused by human activities.
Anthropogenic
Anthropogenic means caused by human activity.
Anthropogenic
Caused by human activities.
Anthropogenic climate change
Climate change resulting from human activities.
Anthropogenic greenhouse-gas increase
An increase in the amount of greenhouse gases in the atmosphere caused by human activity.
Anthropologist
A person who studies human societies and cultures.
Anthropometric data
Measurements of human body sizes and dimensions used to help products fit their intended users.
Anthropometrics
The study and use of human body measurements to inform product dimensions.
Anthropomorphism
The attribution of human behaviour or characteristics to animals or other non-human things.
Anthropomorphism
Representing gods with human forms, emotions and behaviour.
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