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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
Network protocol
A set of rules governing communication between devices on a network.
Network provider
A company that supplies the digital network through which media content travels, such as EE or Sky Broadband.
Network security
Measures used to protect a computer network, its data and its resources from unauthorised access, misuse and harm.
Network topology
The arrangement of devices and the connections between them in a network.
Network vulnerability
A weakness in a network that an attacker could exploit to gain unauthorised access to information or resources.
Net zero
A balance in which greenhouse gas emissions released are matched by greenhouse gases removed from the atmosphere.
Neurological damage
Damage to nerve cells in the brain, for example following a stroke or an injury.
Neuron
A nerve cell specialised to transmit information through the nervous system.
Neuron
A specialised nerve cell that receives and transmits information in the nervous system.
Neuronal growth
The development and strengthening of connections between neurons associated with learning and experience.
Neurone
A nerve cell that carries electrical impulses.
Neurone
A specialised nerve cell that carries electrical impulses.
Neuroplasticity
The nervous system's ability to change and adapt through development, experience or injury.
Neuropsychological test
A standardised task used to assess a mental ability, such as memory, attention or problem-solving, to help understand brain functioning.
Neuropsychology
The study of relationships between the brain, behaviour and mental processes, including memory.
Neuroscience
The study of the nervous system, including how it functions and how its disorders might be treated.
Neuroscience
The scientific study of the nervous system, including the brain.
Neurosis
A historical term for psychological difficulties, such as phobias, in which a person remains in touch with reality.
Neuroticism
A personality dimension involving emotional instability, anxiety and strong reactions to stress.
Neurotransmitter
A chemical released from the end of a neurone that diffuses across a synaptic gap and can trigger a new electrical impulse in the next neurone.
Neurotransmitter
A chemical released by a neurone that diffuses across a synaptic gap and stimulates another neurone.
Neurotransmitter
A chemical messenger that carries signals between nerve cells. Serotonin and noradrenaline are linked to mood and emotion.
Neutral
Having no overall electrical charge because positive and negative charges balance.
Neutral
Having no overall electric charge because the total positive and negative charges balance.
Neutral
Neither acidic nor alkaline; pH 7 on the GCSE pH scale.
Neutral atom
An atom with no overall electric charge because it contains equal numbers of protons and electrons.
Neutral buoyancy
A condition in which upthrust equals weight, so an immersed object has no resultant vertical force.
Neutralisation
A reaction in which an acid reacts with a base or alkali; hydrogen ions and hydroxide ions form water in an acid–alkali neutralisation.
Neutralisation
A reaction in which an acid reacts with a base; an acid reacting with an alkali produces a salt and water.
Neutrality
A country’s position of not taking part in a war. Neutral territory should not be used by belligerent states to conduct military operations.
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