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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
Adaptation
A characteristic or behaviour that helps an organism survive and reproduce in its environment.
Adaptation
A feature or behaviour that helps an organism survive and reproduce in the conditions where it lives.
Adaptation
A feature that enables an organism to survive in the conditions in which it normally lives.
Adaptation
Changing an existing product, service or idea to improve it or make it more suitable for consumers.
Adaptation
The transformation of an existing work into a different media form, such as a novel becoming a television drama.
Adaptive
Having a function that increases the chances of survival and reproduction in a particular environment.
Adaptive trait
A characteristic that helps an organism survive or reproduce in its environment.
Added value
The difference between a product’s selling price and the cost of bought-in inputs used to provide it.
Addiction
Dependence on a substance or activity, such as alcohol, drugs or gambling, that a person finds difficult to control or stop despite harmful consequences.
Addiction
A persistent dependence on a substance or activity that is difficult to control despite harmful consequences.
Addition
A manufacturing approach that builds up a product by adding material or joining components.
Additional Member System
An electoral system combining constituency representatives elected by First Past the Post with additional representatives elected through a compensating party-list vote.
Addition polymer
A polymer formed when many unsaturated monomers join without producing another substance.
Addition polymerisation
A reaction in which many unsaturated monomers join to form a polymer without producing another molecule.
Addition process
A process that builds up material or joins components or layers, for example bonding, sewing or lamination.
Addition reaction
A reaction in which atoms from another molecule join across a carbon–carbon double bond, forming a single carbon–carbon bond and one product.
Additive
A substance added to a material to change its properties or performance.
Additive manufacture
A manufacturing process, such as 3D printing, that builds an object by adding material layer by layer.
Additive manufacturing
Making an object by adding material, usually layer by layer, rather than cutting material away.
Address bus
A set of connections carrying memory addresses from the CPU to identify locations to read from or write to.
Addressee
The person to whom a letter or other communication is addressed.
Adduction
Movement of a limb towards the body's midline.
ADH
A hormone released by the pituitary gland that increases the permeability of kidney tubules to water.
Adhan
The Islamic call announcing prayer.
ADH (antidiuretic hormone)
A hormone released by the pituitary gland that increases the permeability of the kidney's collecting ducts to water.
Adharma
Conduct contrary to dharma: a failure to fulfil moral or religious duty.
Adherence
Continuing to follow an exercise or training programme over time.
Adhesion
The ability of a coating, ink or adhesive to bond to a surface.
Adhesive
A substance used to bond surfaces together.
Adhesive bond
A connection made using an adhesive that bonds the surfaces of materials together.
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