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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
Three-figure bearing
A direction given as an angle measured clockwise from north, written with three figures.
Three-fold Way
The grouping of the Eightfold Path into ethics, meditation and wisdom.
Threefold Way
The grouping of the Eightfold Path into ethics (sila), meditation (samadhi) and wisdom (panna).
Three Jewels
The Buddha, the Dhamma (the Buddha’s teaching) and the Sangha (the Buddhist community), in which Buddhists take refuge.
Three Ks
The Nazi ideal for women's lives: Kinder, Küche, Kirche — children, kitchen, church.
Three Marks of Existence
Three fundamental characteristics of existence taught in Buddhism: anicca (impermanence), anatta (no fixed self) and dukkha (suffering or unsatisfactoriness).
Three Marks of Existence (lakshanas)
Three characteristics of existence taught by the Buddha: dukkha, anicca and anatta.
Three-part ratio
A ratio that has one number for each of three quantities, written in the same order as those quantities, such as .
Three Poisons
Ignorance, greed and hatred: harmful states of mind that cause suffering.
Three Refuges
Declarations of commitment to taking refuge in the Buddha, the Dhamma and the Sangha, known as the Three Jewels.
Three Rs
The principle of replacing animals with alternatives where possible, reducing the number used and refining procedures to minimise suffering.
Three-shot
A shot containing three people within the same frame.
Three-strip Technicolor
A colour-film process that recorded separate colour information on three strips of black-and-white film and used dye transfer to create the colour image.
Threshold
A value against which an input reading is compared to decide which response a program should produce.
Threshold population
The minimum number of customers needed to support a shop or service.
Thrift
Careful management of money and resources, avoiding unnecessary waste.
Throughflow
The sideways movement of water through soil towards a river channel or another surface water body.
Through-hole component
An electronic component whose leads pass through holes in a printed circuit board and are soldered to the board.
Through-hole mounting
A component-mounting method in which leads pass through holes in a printed circuit board and are soldered to pads on the opposite side.
Through-hole technology
A method of mounting electronic components by passing their leads through holes in a circuit board and soldering them to its copper connections.
Throw
A conducting position available to a switch contact set.
Thucydides
An ancient Greek historian who wrote the History of the Peloponnesian War, including narratives of events and reconstructed speeches.
Thyristor
A semiconductor switching component, also called a silicon controlled rectifier (SCR), that can remain conducting after its gate trigger has been removed.
Thyroid gland
An endocrine gland in the neck that produces thyroxine when stimulated by TSH.
Thyroid-stimulating hormone (TSH)
A hormone released by the pituitary gland that stimulates the thyroid gland to release thyroxine.
Thyroxine
A hormone released by the thyroid gland that stimulates basal metabolic rate and is important for growth and development.
Thyroxine
A hormone released by the thyroid gland that stimulates basal metabolic rate and supports growth and development.
Thyrsos
A staff associated with Dionysos and his followers, decorated with ivy and often topped with a pine cone.
Thyrsus
A staff tipped with a pine cone, associated with Bacchus and his followers.
Tibetan Book of the Dead
A Tibetan Buddhist text read to guide a dying or deceased person through the intermediate state between death and rebirth.
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