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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
UNCCD
The United Nations Convention to Combat Desertification: an international agreement supporting action against desertification and the effects of drought.
Uncertainty
The range within which the true value is reasonably expected to lie, arising from limitations in measurements, data, assumptions or models.
Uncertainty
A limitation in how precisely a measurement, estimate or prediction is known.
Uncertainty
A situation in which a business cannot reliably predict future events or their effects.
Uncertainty
An unclear or indeterminate feature of an experience, such as uncertainty about a character’s identity.
Uncodified constitution
A constitution whose rules are found in several sources rather than collected in one authoritative constitutional document.
Uncombined element
An element found in nature without being chemically combined with another element.
Uncompressed data
Data whose storage size has not been reduced using a compression method.
Unconditioned stimulus
A stimulus that produces a response naturally, without that response having to be learned.
Unconscious mind
In Freud’s theory, the part of the mind containing thoughts, memories and desires that are normally inaccessible to conscious awareness but can influence behaviour.
Unconstitutional
Contrary to the Constitution, the fundamental rules establishing how a country is governed and what powers its institutions possess.
Unconventional oil and gas
Oil and gas sources that require additional extraction or processing techniques because the fuel cannot flow freely towards a well.
Uncorrupted
Unaltered from its original divine message.
Undecayed nucleus
A nucleus that has not yet undergone radioactive decay.
Undefined
A value that has no defined numerical result, such as division by zero.
Under-arousal
A state in which a performer's arousal is below the level needed for their best performance.
Underclass
In Murray’s theory, a group at the bottom of society distinguished by welfare dependency and behaviour and values that he believed differed from mainstream expectations. This is a contested description, not simply another name for everyone in poverty.
Undercoat
A paint layer applied beneath the finishing colour coat to help produce an even, rich colour.
Under-employment
Having work but being unable to obtain enough hours, or doing work that does not fully use a person's skills.
Under-employment
Working fewer than full-time hours while being willing to work more hours if they become available.
Underestimate
An estimate less than the exact value.
Under-five mortality rate
The number of deaths of children before their fifth birthday per 1,000 live births.
Underground resistance
Political activity conducted secretly because open organisation is prohibited or dangerous.
Underlying assumption
An assumption about how a probability situation works, such as whether selections are random or whether an object is replaced.
Undermining
Digging beneath a fortification to weaken its foundations and cause part of it to collapse.
Undernourishment
Not getting enough food energy to maintain good health.
Undernutrition
Insufficient food energy or nutrients to maintain health, growth and development.
Under-representation
The inclusion of a social group less frequently or less prominently than its presence in society would suggest.
Underrepresentation
The inclusion of a social group less frequently or less prominently than other groups in media products.
Understatement
An expression that deliberately makes an experience seem less dramatic or important than it might be.
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