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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
Predation
An interaction in which one organism, the predator, kills and eats another organism, the prey.
Predator
A consumer that kills and eats another animal.
Predator
A consumer that kills and eats other animals.
Predestination
The belief that Allah has already decreed everything that will happen; in Islam this is called al-Qadr.
Predetermined
Decided in advance; for example, the intended outcome of a sporting action.
Pre-determined movement
Movement with an intended action and expected outcome decided before it is performed.
Prediction
Forecasting where and when a hazard may occur and how severe it may be.
Prediction
A statement of the outcome expected in a particular situation if an explanation is correct.
Prediction
A conclusion about an unknown case based on an established pattern and relevant evidence.
Prediction
A statement of what should happen in a specified situation if an explanation is correct.
Prediction
An expected observation or result deduced from a hypothesis or scientific explanation.
Prediction
An estimate of an unknown or future value based on patterns in existing data.
Pre-emptive strike
An attack launched first to prevent an anticipated enemy attack.
Prefab
A factory-made house assembled quickly from prefabricated sections, used to provide temporary accommodation after the Second World War.
Prefabrication
Construction using standard components manufactured in advance and assembled on site.
Prefect
An appointed Roman official responsible for a particular service or territory, such as the grain supply or Egypt.
Preference test
A sensory test that assesses which food people prefer or how much they like it.
Preferential option for the poor
The Catholic principle that the needs of the poorest and most vulnerable should receive particular priority in decisions and actions.
Preferred reading
The interpretation of a media product that its producer encourages the audience to accept.
Prefix
A letter or symbol placed before a unit to show a particular power-of-ten multiple or fraction of that unit, such as kilo- or milli-.
Prefix
A word part and symbol that scale a unit by a power of ten; for example, kilo (k) means and milli (m) means .
Prefix
A symbol placed before a unit to show that the unit has been multiplied by a particular power of ten.
Prefix
A word or symbol placed before a unit to indicate a particular multiplier, such as kilo (k), meaning .
Prefix
Letters added to the beginning of a word to form another word, such as ‘un-’ in ‘unnecessary’.
Prefix
A word or symbol placed before a unit to indicate a multiple of that unit, allowing large quantities to be written more compactly.
Prefix
A word or symbol placed before a unit to indicate a multiplying factor. For example, kilo means , so one kilometre equals 1000 metres.
Prefix-free code
A set of codes in which no complete code is the beginning of another complete code.
Prefrontal cortex
A region towards the front of the brain involved in decision-making, including moral judgements.
Preheating
Heating an oven to the required cooking temperature before putting food inside.
Prejudice
A prejudgement about a person or group, rather than a judgement based on their individual actions or qualities.
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