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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
Tombolo
A ridge of deposited sediment connecting an island to the mainland.
Tonal shift
A change in the attitude or feeling conveyed by a speaker, such as a movement from affectionate recollection to stern scolding.
Tondo
The circular picture painted inside a cup.
Tone
The attitude or feeling conveyed by a text’s voice and wording, such as tenderness, anger or uncertainty.
Tone
The attitude conveyed by a writer’s voice, such as concern, confidence, respect or urgency.
Toner
Fine powder used to form the printed image in a photocopier or laser printer.
Tonne of oil equivalent
A common energy unit used to compare different fuels by their energy content. Statistics often use million tonnes of oil equivalent, abbreviated to mtoe.
Tooling
Production equipment used to shape or make products, such as moulds and dies.
Tooling cost
The cost of making or purchasing production tools, such as the mould used to shape a polymer product.
Toolpath
The programmed route followed by a cutting tool during manufacture.
Tooth
The slight grain or roughness of a drawing surface that helps it hold pencil marks.
Tooth decay
Damage to teeth caused by acids produced when bacteria in dental plaque use sugars.
Top-down approach
Development planned and directed by governments or large organisations, with decisions made centrally.
Top-down development
Development in which governments or transnational corporations lead decisions and organise projects.
Top-down management
An approach in which government or other powerful organisations plan and direct improvements.
Top-down processing
Using existing knowledge and expectations to interpret incoming sensory information.
Top-down strategy
A large-scale approach in which governments or other powerful organisations make decisions and direct investment.
Topiary
A shrub or tree clipped into a deliberately shaped form.
Topic sentence
A sentence stating the main argument of a paragraph and showing how it contributes to the essay’s answer.
Topic sentence
A sentence that establishes a paragraph’s main focus, often near its beginning.
Topological map
A map that emphasises connections between places rather than their exact distances, directions or shapes.
Topstitching
Visible stitching worked from the outside of a textile product, which can secure layers or folded seam allowances and contribute to its appearance.
Torah
The first five books of the Jewish scriptures, containing teachings and the 613 mitzvot traditionally understood to have been given by God to Moses.
Torah scroll
A handwritten scroll containing the first five books of the Hebrew Bible, used for public readings during Jewish worship; also called a Sefer Torah.
Tories
The political grouping that opposed exclusion and defended hereditary succession and royal authority.
Torn cartilage
A tear in the cushioning tissue at a joint, commonly involving the meniscus in the knee.
Torpedo ram
A warship combining a reinforced ram with torpedo tubes, designed to ride low in the water. The Thunder Child uses its forward momentum to attack the Martian fighting-machines.
Torque
The turning effect of a force on a shaft or rotating component.
Torsion
A twisting action produced when turning forces act in opposite directions on a material or object.
Torture
The deliberate infliction of severe physical or mental suffering to obtain information, punish, intimidate or control someone.
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