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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
Qadi
A judge who decides cases involving Islamic law within the authority given to their court.
Qawwali
A form of Sufi devotional music associated particularly with India and Pakistan, combining spiritual poetry with expressive singing.
Qayamat
Resurrection, when people are raised from death to face Allah’s judgement.
Qiblah
The direction towards Makkah which Muslims face during salah.
Qisas
The Islamic principle of proportionate retaliation for certain offences, including ‘a life for a life’ in cases of murder.
Qiyas
Reasoning by analogy: applying an established ruling to a new case because both share the reason underlying that ruling.
QTC
Quantum Tunnelling Composite: a material whose electrical resistance decreases when it is compressed.
Quackery
The selling of supposed cures through misleading claims, often by unqualified people seeking profit.
Quadrant
One of the four regions formed by the -axis and -axis.
Quadrat
A frame enclosing a known area, used to sample features such as plant cover.
Quadrat
A square frame used to sample organisms within a known area.
Quadrat
A frame enclosing a known area, used to sample organisms such as plants or slow-moving animals.
Quadratic equation
An equation that can be written as , where , and are constants and .
Quadratic expression
A polynomial expression whose highest power of the variable is 2, usually written in the form where .
Quadratic formula
A formula for solving : .
Quadratic function
A function whose highest power of the variable is 2, usually written in the form , where .
Quadratic graph
A graph of an equation containing an term as its highest power of . It has a U-shaped or upside-down U-shaped curve.
Quadratic inequality
An inequality containing a squared variable, such as x² − 4 < 0.
Quadratic sequence
A sequence whose nth term can be written in the form , where , and are constants and .
Quadriceps
A muscle group at the front of the thigh that straightens the knee.
Quadriceps group
The group of muscles at the front of the thigh that straightens the leg at the knee.
Quadriga
A chariot drawn by four horses abreast.
Quadrilateral
A four-sided polygon.
Quadrivium
The four mathematical subjects traditionally studied together: arithmetic, geometry, astronomy and music.
Quaker
A member of a Christian religious movement whose beliefs include peace, justice and the equality of all people.
Quaker
A member of the Religious Society of Friends, a religious movement historically associated with peace, equality and opposition to war.
Quakers
A religious movement associated with George Fox which taught that God guided individuals directly through an Inner Light, rejecting church hierarchy and encouraging women as well as men to speak at meetings.
Qualified judgement
A judgement that recognises a limitation or exception instead of making an absolute claim.
Qualifying foreign citizen
For Welsh local election candidacy, a citizen outside the Commonwealth, Irish and EU citizenship categories who does not need permission to enter or remain in the UK, or who has indefinite leave to remain.
Qualitative analysis
Analysis that establishes which substance or substances are present.
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