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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
Machine code
Instructions encoded in binary that a processor can execute directly.
Machine-dependent
Designed for a particular processor architecture rather than being readily usable across different processor types.
Machine embroidery
Embroidery in which a sewing or embroidery machine forms the decorative stitches.
Machine learning
An approach to artificial intelligence in which a system learns patterns from data to perform a task, rather than having every decision explicitly programmed.
Machinery
Powered equipment used to carry out manufacturing operations such as cutting, drilling or sanding.
Machine screw
A fastener generally threaded up to its head, which engages with a matching internal thread in a component or nut.
Machine tool
Powered equipment used to carry out operations such as cutting, drilling, shaping or sewing.
Machine tractor station
A state centre supplying tractors and other agricultural machinery to collective farms.
Macro
A named sequence of instructions used to carry out a task through a single command.
Macromolecule
A very large molecule, such as an individual polymer molecule.
Macronutrient
A nutrient needed in relatively large amounts in the diet. Carbohydrates, proteins and fats are macronutrients.
Macronutrient
A nutrient needed in relatively large amounts. Fat, protein and carbohydrate are macronutrients.
Macroscopic scale
The size range of objects that can normally be seen and handled directly, rather than individual atoms or molecules.
Macuahuitl
A wooden sword-club fitted with sharp obsidian blades, used in close combat.
MAD
Mutually Assured Destruction: the situation in which both sides possess enough nuclear weapons to destroy the other, even after suffering an initial attack.
Madhhab
A school of Islamic legal interpretation with an established approach to deriving rulings.
Maenad
A female follower of Dionysos, commonly represented dancing in religious ecstasy.
Magga
The path leading to the cessation of suffering, expressed through the Noble Eightfold Path.
Magic
Supernatural power used to affect people, events or the natural world. In The Tempest, Prospero's learned art enables him to command spirits.
Magic bullet
A treatment intended to attack the microorganism causing a disease without harming the rest of the patient’s body.
Magic stones
Lines of stones laid across a slope to slow runoff, trap soil and organic matter, and encourage water to soak into the ground.
Magister equitum
The ‘master of horse’, normally the dictator's subordinate military commander.
Magisterium
The teaching authority of the Catholic Church, exercised by the Pope and the bishops in communion with him.
Magistrate
An official who dealt with local legal cases and helped organise law enforcement.
Magistrate
A holder of a Roman public office, such as a quaestor, praetor or consul.
Magistrate
A volunteer, also called a Justice of the Peace, who hears cases in a magistrates’ court and deals with less serious offences.
Magistrate
An unpaid, trained volunteer who hears and decides cases in a magistrates’ court, with advice on the law.
Magistrates’ court
A court that deals with less serious criminal offences and holds initial hearings for more serious offences. Cases are heard by magistrates or a district judge, without a jury.
Magma
Molten rock beneath Earth’s surface. Once it erupts onto the surface, it is called lava.
Magma chamber
An underground reservoir where magma is stored.
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