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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
Bubble sort
A sorting algorithm that repeatedly compares adjacent items and swaps them if they are in the wrong order.
Bubo
A painful swelling associated with plague.
Buboes
Painful swellings associated with bubonic plague, commonly found in the armpits or groin.
Bubonic plague
A bacterial disease which commonly causes fever and swollen lymph nodes, called buboes; it can be transmitted through bites from infected fleas.
Buckling
Sideways deformation of a structure under compression, such as a thin card wall bowing under a downward load.
Buckminsterfullerene
A spherical fullerene molecule containing 60 carbon atoms, with the formula C₆₀.
Buckminsterfullerene
The first fullerene to be discovered: a spherical, hollow molecule containing 60 carbon atoms, with formula .
Buddha
A title meaning ‘awakened one’ or ‘enlightened one’, given to Siddhartha Gautama after his Enlightenment.
Buddhahood
The state of being a fully enlightened Buddha.
Buddha-nature
The potential within beings to become enlightened and attain Buddhahood.
Buddha rupa
An image or statue of the Buddha used as a focus for respect, reflection and Buddhist practice.
Buddharupa
An image or statue of the Buddha, used as a focus for reverence and reflection on his example and teachings.
Buddhavamsa
A Buddhist scripture recounting the lives of Buddhas, including Gotama, whose life is the subject of the prescribed passage Buddhavamsa XXVI.
Buddhist Action Month
An annual festival of Buddhist social action held in June, which began in Britain in 2012.
Buddhist Hospice Trust
A voluntary charity established in 1986 to offer information, spiritual friendship and compassionate support from a Buddhist perspective to the living, dying and bereaved.
Budget
The government’s annual proposals for raising revenue through taxation and spending public money.
Budget
An amount of money allocated for a particular activity or period.
Budget
The amount of money available or allocated for a project.
Budget
The government's financial plan setting out expected revenue, spending and how any shortfall will be financed.
Budget constraint
A limit on the money available to design, develop or manufacture a product.
Budget deficit
The amount by which government spending exceeds government revenue during a particular period, usually a year.
Budget deficit
A shortfall arising when government spending exceeds its revenue over a particular period.
Budgeted sales
Planned or forecast sales for a particular period, rather than sales already achieved.
Budgeting
The process of planning expected income and expenditure over a period and checking whether the plan remains affordable.
Buffer solution
A solution that resists changes in pH and therefore keeps the reaction mixture at a chosen pH.
Buffer solution
A solution that maintains a nearly constant pH during a reaction.
Buffer state
A country positioned between potentially hostile powers, intended to provide protection against attack.
Buffer stock
Spare stock held to cover unexpected demand or delays in supply.
Buffer zone
An area of friendly or controlled countries separating a state from potential enemies.
Buffer zone
An area around a highly protected habitat where activities are controlled to reduce disturbance to the protected area.
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