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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
Delimiter
A character used to separate items of data. In a simple CSV file, the field delimiter is a comma.
Delinquency
Crime and deviance committed by young people, usually referring to relatively minor behaviour.
Delinquency
Antisocial or law-breaking behaviour, particularly by young people. Heaven measured participants’ own reports of interpersonal violence and vandalism/theft.
Delinquent subculture
A group whose shared norms and values encourage offending or other rule-breaking, especially among young people.
Delivery reliability
How consistently a supplier delivers orders as agreed, including arriving on time.
Delocalised electron
An electron that is not confined to one bond and can move through part of a structure.
Delocalised electron
An electron that is not tied to one atom or bond and can move through a structure.
Delocalised electrons
Electrons that are not tied to one atom or one bond and can move through a structure.
Delta
A depositional landform at a river mouth that develops where sediment accumulates faster than it is removed.
Deltoid
The muscle covering the shoulder that helps raise the arm.
Delusion
A strongly held false belief that resists argument and is not explained by the person’s cultural background.
Demagogue
A political leader who gains or maintains influence by appealing to the people rather than exercising responsible leadership.
Demand
The quantity of a product that consumers want and are able to buy.
Demand
The level of desire or need for a product.
Demand
The quantity of a product customers are willing and able to buy at a particular price over a given period.
Demand
The quantities of a material or product that buyers are willing and able to purchase at different prices.
Demand characteristic
Cues in a research situation that lead participants to infer what is expected of them and may change their behaviour.
Demand characteristics
Cues that help participants guess a study’s aim and may lead them to change their behaviour.
Deme
A local Athenian community in which citizens were registered.
Demerger
The splitting of a company into separate businesses or components.
Demesne
Land kept by a lord for their own use, rather than granted to tenants.
Demilitarisation
The dismantling of a country’s armed forces and military institutions, and the removal or control of its capacity to wage war.
Demilitarised
Kept free of military forces and fortifications.
Demilitarised city
A place from which military forces and installations have been removed.
Demilitarised zone
An area in which armed forces and military defences are forbidden.
Demilitarised zone (DMZ)
A buffer area from which opposing military forces are withdrawn. In Korea, the armistice required withdrawal by 2 km on each side of the military demarcation line.
Demobilisation
The process of releasing soldiers and sailors from military service when they are no longer needed.
Democracy
A system of government in which the people exercise political power. In Pericles’ account, Athenian democracy favours the majority rather than the few; this does not establish that every inhabitant possessed equal political rights.
Democracy
A system of government in which the citizen body exercises political power, including debating and deciding public policy. In Athens, this did not mean participation by every resident.
Democracy
A political system in which people can influence government through free, fair and competitive elections, supported by political rights and freedoms.
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