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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
Mass number
The total number of protons and neutrons in the nucleus of an atom.
Mass Observation
A project that collected evidence about everyday life, thoughts and feelings in Britain, including wartime diaries, responses to questions and observational reports.
Mass production
Producing large quantities of standardised goods using machinery and repeated manufacturing processes.
Mass production
The manufacture of very large quantities of standardised products, usually using automated production lines.
Mass setting
A musical arrangement of texts used in the Mass, allowing its prayers and responses to be sung.
Mass spectrometry
An analytical technique that produces a spectrum by detecting ions according to their mass-to-charge ratio.
Mass spectrum
A chart showing the mass-to-charge ratios of detected ions and their relative abundances.
Mass-to-charge ratio
The mass of an ion divided by the size of its charge; written as m/z.
Mass tourism
Tourism involving large numbers of holidaymakers, supported by transport, accommodation and attractions serving a broad market.
Mass transit
Public transport designed to move large numbers of passengers, such as metro trains, suburban railways or high-capacity bus services.
Mass unemployment
A situation in which large numbers of people who are willing and able to work cannot find jobs.
Mass vaccination
An organised programme offering vaccination to large numbers of people to protect individuals and reduce the spread of disease.
Master of Horse
The Roman officer who served as a dictator’s deputy.
Master of the Horse
The Roman dictator’s subordinate deputy, who could take command in the dictator’s absence.
Master status
A status that becomes the dominant feature through which others see a person, overshadowing their other roles and qualities.
Master weaver
A weaver who ran a business, secured customers and employed other workers.
Master weavers
The people who controlled silk production and employed or organised other weavers.
Masthead
The publication’s title displayed on a magazine cover or newspaper page.
Mast pond
A pool used to keep timber for ships’ masts wet, preventing it from drying out and cracking before use.
Matched pairs
Pairs of participants with similar relevant characteristics, with one participant in each experimental group.
Matched pairs
An experimental design in which participants are paired on relevant characteristics, with one member of each pair in each condition.
Matched pairs design
An experimental design in which participants are paired on relevant characteristics, with one member of each pair completing each condition.
Match-fixing
Deliberately arranging or manipulating a sporting result rather than allowing it to be decided by fair competition.
Matchlock
A firearm mechanism that uses a burning cord to ignite the gunpowder needed to fire the weapon.
Match-on-action
A continuity technique in which an action begun in one shot continues across a cut into another.
Material cost
The expense of buying the material needed to make a product.
Material culture
Surviving physical evidence of a society, including buildings, objects and archaeological remains.
Material cycling
The repeated movement and reuse of substances between living organisms and the non-living environment.
Material cycling
The movement and reuse of materials between the living and non-living parts of an ecosystem.
Material deprivation
A lack of financial and material resources, such as adequate housing or money for study materials.
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