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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
Moving-coil microphone
A microphone in which sound makes a coil move relative to a magnetic field, inducing an electrical signal.
Moving pivot
A pivot that joins moving parts and changes position as the linkage operates.
MP
A Member of Parliament: an elected representative who holds a seat in the House of Commons.
MRI
Magnetic resonance imaging: a scanning technique using a strong magnetic field to help produce detailed images inside the body.
MRI
Magnetic resonance imaging: a technique that produces detailed images of structures inside the body, including the brain.
MRI scanning
A technique that uses magnetic fields to produce detailed images of the brain.
mRNA
Messenger RNA: a single-stranded RNA molecule that carries a copy of a gene’s instructions to a ribosome.
MRSA
Methicillin-resistant Staphylococcus aureus, a strain of bacterium resistant to antibiotics, including methicillin.
MRSA
Methicillin-resistant Staphylococcus aureus: a strain of bacteria resistant to several antibiotics and therefore difficult to treat.
Mubah
An action that is morally neutral under Islamic law, leaving a person free to choose.
Muck raker
A worker who swept streets and removed rubbish and waste.
Mucus
A sticky substance that traps pathogens and other particles in the airways.
Mucus
A sticky substance that traps particles and pathogens in the nose and airways.
Mudra
A symbolic hand gesture associated with a Buddha or bodhisattva, expressing a teaching or spiritual quality.
Mughal dynasty
The ruling family established in India by Babur in 1526, whose emperors gradually expanded Mughal power.
Mughal miniature
A small, finely detailed painting associated with the Mughal court, often made on paper for an illustrated manuscript or an album.
Mughals
The Muslim ruling dynasty that established an empire in India in 1526 and expanded it under emperors including Akbar.
Muhammad al-Mahdi
The twelfth Imam in Twelver Shi’a Islam, believed to remain alive but hidden and destined to return to establish justice.
Muhtasibs
Officials appointed to supervise public morals and enforce rules on conduct, including restrictions on public drinking and gambling.
Mujahideen
Muslim guerrilla fighters who resisted Afghanistan’s communist government and Soviet forces during the Afghan War.
Mukti
Spiritual liberation from the cycle of birth and rebirth, understood in Sikhism as union with God.
Multicellular organism
An organism made of many cells.
Multicultural
Describes a society in which people from different cultural backgrounds live.
Multicultural community
A community in which people with different cultural backgrounds live alongside one another.
Multicultural community
A community containing people from different cultural backgrounds, including different ethnicities, languages and religions.
Multiculturalism
The view that different cultural groups' cultures and identities should be respected and maintained.
Multicultural society
A society in which people with different cultural backgrounds, traditions and identities live alongside one another.
Multicultural society
A society in which people from different cultural backgrounds live together.
Multidimensional poverty
Deprivation across several aspects of life, such as education, health, housing and access to basic services, rather than low income alone.
Multi-ethnic society
A society whose members come from different ethnic backgrounds. Ethnicity can involve shared ancestry, culture, language and traditions.
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