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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
Pilot survey
A small-scale trial of a survey used to identify problems before the main collection takes place.
Pilum
A Roman throwing spear used before close combat, which could injure an enemy or become lodged in a shield.
Pin bone
A small bone remaining within a fish fillet after it has been removed from the main skeleton.
Pind daan
A Hindu ritual performed for deceased ancestors, commonly practised at Varanasi.
Pineal gland
A small endocrine gland in the brain that produces and releases melatonin.
Ping-pong diplomacy
The use of exchanges between American and Chinese table-tennis players in 1971 to help improve relations between their countries.
Pin-money
Money allowed to a wife for her personal expenses.
Pinout diagram
A diagram identifying the physical pins of an electronic component and their functions.
Pinyin
A system that uses Latin letters to represent the sounds of Mandarin Chinese, helping learners pronounce words and characters.
Pioneer
An early migrant who moved into an area to establish a farm or settlement.
Pious
Deeply religious and devoted to the duties of one’s faith.
Pipette
A piece of apparatus used to transfer one accurately measured, fixed volume of solution.
Pipe/tube
A hollow length of material, commonly with a circular cross-section.
Pipiltin
The Aztec nobility, who held land and dominated important positions in government, the military, the courts and the priesthood.
Piping
A fabric-covered cord or folded fabric insert sewn into an edge or seam to provide decoration, strength and definition.
Piping
Forcing a soft mixture through a piping bag, often fitted with a nozzle, to form a controlled shape or pattern.
Piracy
Attacking and robbing ships at sea without state authorisation.
Pirate radio
A radio station broadcasting without authorisation; British offshore stations such as Radio Caroline became important sources of pop music in the 1960s.
Pirate radio
Radio broadcasting without the required authorisation or licence.
Piston
A sliding component that changes the volume of an enclosed gas when it moves inside a cylinder.
Pitch
The distance between the centres of adjacent pins or other repeated features.
Pithoi
Large pottery storage jars used for keeping supplies in Mycenaean buildings.
Pithos
A large jar. In Hesiod’s account, Pandora opens a jar and releases miseries upon humanity.
Pituitary gland
An endocrine gland at the base of the brain that releases several hormones, some of which stimulate other glands to release hormones.
Pituitary gland
An endocrine gland at the base of the brain that releases several hormones, including hormones that stimulate other endocrine glands.
Pity
Compassion for another person's suffering, leading someone to wish to relieve it.
Pivot
The point about which an object turns.
Pivot
A point about which a part turns or swings.
Pivot joint
A joint that allows rotation around a single axis, such as the joint between the atlas and axis in the neck.
Pixel
A single picture element in a bitmap image, with one colour.
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