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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
Unofficial responses
Attitudes and actions of people outside government, including neighbours, workers, traders and crowds, towards migrants.
Unofficial strike
A strike begun without the formal authorisation of the workers’ trade union leadership.
Unpaid care
Looking after or helping someone who needs support without receiving wages for doing so.
Unpaid domestic labour
Household work, such as cleaning, cooking and caring, carried out without wages.
Unprefixed unit
A unit written without a prefix, such as metre, gram or joule. It can provide a convenient intermediate step when converting between prefixed units.
Unrealistic expectation
Beliefs about how family members or relationships should behave that overlook the difficulties and variation found in real family life.
Unrecorded crime
A crime brought to police attention that does not enter police-recorded crime statistics.
Unreliable narration
A narrative account whose accuracy or interpretation the reader has reason to question, for example because of self-interest or limited understanding.
Unreliable narrator
A speaker whose account cannot be accepted without questioning their biases, motives or interpretation of events.
Unreliable speaker
A voice whose account or judgements cannot be accepted uncritically because they are distorted, misleading or limited.
Unreported crime
A crime that is not brought to the attention of the police.
Unrepresentative data/sample
Data or a sample that does not accurately reflect the wider population being studied.
Unrepresentative sample
A sample that does not reflect the relevant characteristics of its population.
Unrequited love
Love that is not returned by the person who receives it.
UN Resolution 181
The UN General Assembly resolution adopted on 29 November 1947 proposing Jewish and Arab states in Palestine, with Jerusalem under international administration.
UN Resolution 242
United Nations Security Council resolution adopted on 22 November 1967, calling for Israeli withdrawal from occupied territories alongside recognition of states’ right to live in peace and security.
Unrestricted submarine warfare
Attacking shipping in a declared war zone without warning, including neutral ships.
UNRWA
The United Nations Relief and Works Agency, which provided relief for Palestinian refugees.
Unsaturated
A molecule containing a carbon–carbon double bond, so it has fewer hydrogen atoms than the corresponding alkane.
Unsaturated fat
Fat containing fatty acids with at least one carbon–carbon double bond. It includes monounsaturated and polyunsaturated fats.
Unsaturated hydrocarbon
A hydrocarbon containing at least one carbon–carbon double bond.
UNSCOM
The United Nations Special Commission, established in 1991 to carry out weapons inspections and oversee the elimination of Iraq’s weapons of mass destruction.
Unseen character
A character who does not appear on stage but whose actions or experiences influence the drama.
Unseen extract
A passage that you have not studied beforehand and must interpret using the information provided and its own details.
Unseen poem
A poem encountered without having studied it beforehand; its printed text provides the evidence for your interpretation.
Unseen text
An examination text that you have not studied during the course.
Unsigned binary
A binary representation of a non-negative whole number in which no bit is used to indicate a negative sign.
Unsigned integer
An integer represented without a positive or negative sign; all its bits contribute to a non-negative value.
Unskilful action
Action rooted in harmful states such as greed, hatred or ignorance, which contributes to suffering.
Unskilfulness
Morally unwholesome thought or conduct associated with greed, hatred and delusion.
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