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GCSE History
3,150 key terms
Obeisance
A gesture of submission or respect towards a superior, such as bowing or prostrating oneself.
Observer status
A position allowing a non-member to attend and participate in an organisation’s proceedings without the full rights of membership.
Obverse
The front face of a coin or tablet; on these coins it carries Alexander’s portrait.
Occupation
The control of a country or territory by foreign armed forces.
Occupation zone
An area of a defeated country placed under the authority of a foreign occupying power.
Occupied territories
Territories under the control of another state’s armed forces. In the First Intifada, the central territories were the Gaza Strip and West Bank, including East Jerusalem, occupied by Israel in 1967.
Occupied territory
Land controlled by the armed forces of another state. Military occupation does not, by itself, transfer sovereignty over that land.
Office of Price Administration (OPA)
A government agency created by Roosevelt in April 1941 which regulated wartime prices and administered rationing.
Official responses
Actions and policies of authorities, such as the Crown, Parliament and local officials, towards migrants.
Oikos
The ancient Greek household, including its family, property and dependants.
Okhrana
The Tsarist secret police, which monitored, infiltrated and suppressed opposition movements.
Old Bailey
London’s major criminal court, where serious criminal cases were tried.
Old Bolsheviks
Long-standing Bolshevik Party members who had worked with Lenin before or during the 1917 Revolution.
Old English
The Germanic language spoken by the Anglo-Saxons, which formed the foundation of the later English language.
Old Lights
Opponents of revivalism who defended established religious authority and more traditional worship.
Old Pretender
James Francis Edward Stuart, son of James VII and II and the claimant supported by the Jacobites in 1715. His opponents called him the Old Pretender because they rejected his claim to the throne.
Oligarchy
Government in which political power is held by a small group rather than by one ruler or the wider citizen body.
Omen
An event interpreted as a sign of what will happen in the future.
Omens
Signs interpreted as messages from the gods about whether a proposed action would succeed or receive divine approval.
One Child policy
A Chinese population-control policy introduced in 1979 which sought to limit most couples to one child, although its implementation and exceptions varied.
One-party state
A political system in which only one party is permitted to exercise power, preventing rival parties from freely competing to form a government.
OPEC
The Organization of Petroleum Exporting Countries, whose members coordinate oil policies, including production targets.
Open-field system
A farming arrangement in which large village fields were divided into strips cultivated by different households.
Open prison
A prison with lower security and more relaxed conditions, intended for suitable prisoners who can be trusted with greater responsibility.
Open range
Unfenced grazing land used by cattle ranchers, which was increasingly divided by farms and fences.
Open-range ranching
Raising cattle on large areas of unfenced land, much of it public land available for free grazing.
Operation Barbarossa
The German invasion of the Soviet Union, launched on 22 June 1941.
Operation Enduring Freedom
The US-led military operation launched in Afghanistan on 7 October 2001, with British participation, against al-Qaeda and the Taliban regime.
Operation Linebacker
The sustained US air offensive against North Vietnam in 1972, intended to disrupt its supplies and help stop its offensive against South Vietnam.
Operation Rolling Thunder
The sustained US bombing campaign against North Vietnam and supply routes, lasting from March 1965 to November 1968.
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