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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
Ode
A lyric poem with an organised verse form; Horace’s odes adapt Greek poetic forms into Latin.
Oestrogen
An ovarian hormone that helps rebuild and maintain the uterus lining, inhibits FSH and, at a high level, stimulates LH release.
Oestrogen
A reproductive hormone produced by the ovaries that causes female secondary sex characteristics to develop and rebuilds the uterus lining. It also helps regulate other menstrual-cycle hormones.
Ofcom
The Office of Communications: the UK regulator responsible for areas including television and radio broadcasting.
Offender
A person who has committed a crime.
Offering
Food, objects or other gifts presented to gods or the dead as part of a religious ritual.
Offering
An item presented at a shrine to express respect and gratitude, often also symbolising a Buddhist teaching.
Office of Price Administration (OPA)
A government agency created by Roosevelt in April 1941 which regulated wartime prices and administered rationing.
Official
A person who applies the rules and controls a sporting contest, such as a referee or umpire.
Official crime statistics
Quantitative crime data compiled by official bodies, including police-recorded figures collected by the Home Office and official survey estimates.
Official crime statistics
Records collected and published by government agencies. Police-recorded crime statistics count offences reported to or detected by the police and recorded by them.
Official Opposition
The largest party in the House of Commons that is not in government.
Official responses
Actions and policies of authorities, such as the Crown, Parliament and local officials, towards migrants.
Official statistics
Numerical information produced by government bodies or other official organisations.
Offset lithography
A commercial printing process that transfers an inked image from a printing plate to a rubber blanket and then onto paper or board.
Offshoring
Moving business activities from the home country to another country.
Off-the-job training
Training undertaken away from an employee’s normal work duties, such as a course at a college or training centre.
Off-the-shelf software
Ready-made software supplied for general use rather than developed specifically for one customer's requirements.
Ofsted
The Office for Standards in Education, Children's Services and Skills, which inspects schools and other education and children's services in England.
Ohio Gang
The name given to dishonest friends and associates whom President Warren G. Harding brought into his administration.
Ohm
The unit of resistance, with symbol Ω.
Ohmic conductor
A conductor for which current is directly proportional to potential difference when its temperature is constant.
Ohmic conductor
A conductor whose current is directly proportional to the potential difference across it, provided its temperature remains constant.
Ohmmeter
A meter that measures electrical resistance directly, in ohms (Ω).
Ohm’s law
The current through a conductor is directly proportional to the potential difference across it, provided its temperature remains constant.
Ohm’s law
For a conductor at constant temperature, current is directly proportional to potential difference. The relationship is expressed as .
Oikos
The ancient Greek household, including its family, property and dependants.
Oikos
An ancient Greek household, including its family, dependants, property and resources, rather than simply the building in which people live.
Oil consumption
The amount of oil and oil products used over a given period.
Oil demand
The quantity of oil that consumers are willing and able to buy at a given price.
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