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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
KD fitting
A knock-down fitting: a standard connector used to assemble parts, particularly in flat-pack furniture.
Kedushah
Holiness: being set apart for a sacred or elevated purpose.
Keep
A fortified tower within a castle, providing a defensible stronghold.
Kellogg–Briand Pact
The 1928 international agreement rejecting war as an instrument of national policy and committing its signatories to settle disputes peacefully.
Kelvin scale
The absolute temperature scale, beginning at absolute zero; its unit is the kelvin, K.
Kelvin scale
A temperature scale starting at absolute zero. A change of 1 K is the same size as a change of 1 °C.
Kerf
The width of material removed by a cutting tool, such as a saw blade.
Keriah
The tearing of clothing to express grief following the death of a close relative.
Kerner Report
The 1968 report of a commission established by President Johnson to investigate urban riots. It linked unrest to racial inequality, poor living conditions and failures of policing.
Kesh
Uncut hair, expressing respect for God's creation and commitment to Sikh discipline.
Ketubah
A Jewish marriage contract recording marital obligations; contemporary Reform versions often express the spouses’ mutual responsibilities and commitments.
Ketuvim
The Writings: the section of the Tenakh containing varied sacred writings, including Psalms, Proverbs and Job.
Kevlar
A strong, lightweight synthetic fibre used in products such as body armour and protective clothing.
Key
The explanation of the symbols, colours and shading used on a map.
Key
An explanation of what each symbol, colour or style in a diagram denotes. In a pictogram, it also states the numerical value represented by one symbol.
Key
An identifier used to access an associated value in a dictionary.
Key
A guide explaining what the colours, shades, patterns or symbols in a diagram represent.
Keyhole surgery
Surgery performed through small cuts using a camera and specialised instruments.
Keying
Lightly roughening a surface to help an adhesive bond to it.
Key logger
Software that records keystrokes. When used maliciously, it can steal information such as usernames and passwords.
Keylogging
Recording the keys pressed on a keyboard. Malicious software can use this to capture information such as passwords.
Key or legend
The part of a map that explains its colours, symbols and other markings.
Key point
A point such as an intercept, turning point or endpoint that can be transformed first to help construct the new graph.
Key sequence
A connected passage of a film chosen for detailed study because it is important to its meanings, characters or construction.
Key stage
An age-based phase of schooling in England with specified curriculum content.
Keystone species
A species that has a particularly important influence on the ecosystem and helps support other species.
Khalifah
The Muslim belief that humans are trustees of Allah’s creation and must care for it responsibly.
Khalsa
The community of initiated Sikhs founded by Guru Gobind Singh in 1699.
Khand
A stage or realm of spiritual development; the five khands describe progression towards liberation.
Khanda
A Sikh symbol combining a circle, a central double-edged sword and two outer swords, expressing beliefs about God and spiritual and worldly responsibilities.
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