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GCSE History
3,150 key terms
Operation Valkyrie
An emergency mobilisation plan for the Reserve Army which the July 1944 conspirators intended to use to seize power after killing Hitler.
Oppidum
A fortified settlement in Iron Age Europe; the plural is oppida. Such settlements could be important centres of local power.
Opposition
Disagreement with a government or its policies, which may be expressed privately or publicly.
Optics
The study of light and vision.
Oracle
A sacred place where people sought a god’s answer or advice, usually communicated through a priest or priestess.
Oral tradition
Accounts of the past passed between people and generations by word of mouth.
Oratory
The skill or practice of public speaking.
Ordeal
A dangerous test believed to allow God to demonstrate whether a person was innocent or truthful.
Oregon Trail
An overland migration route used by settlers travelling towards Oregon, crossing the Rocky Mountains through South Pass.
Organised crime
Criminal activity carried out by groups with continuing organisation, often using violence and bribery to protect their profits.
Organ rejection
The immune system attacking a transplanted organ because it recognises it as foreign.
Orthodox Christianity
The eastern Christian tradition associated with the Patriarch of Constantinople, distinct from the western Catholic Church headed by the pope.
Orthodox interpretation
An interpretation of the Cold War’s origins that places the main responsibility on Soviet expansion and presents American policy as a defensive response.
Orthodox view
The established critical interpretation that appeasement was a serious misjudgement which failed to prevent war.
Ostracism
An Athenian voting procedure that could send a citizen away for ten years without convicting him of a crime; he retained the income from his property.
Ostrakon
A piece of broken pottery on which a citizen scratched the name of the person he wanted ostracised. The plural is ostraka.
Ottoman Empire
The empire ruled by the Ottoman sultan, centred on modern-day Turkey; it fought alongside Germany and Austria-Hungary in the First World War.
Outflank
To move around the side of an enemy formation so that it can be attacked from the side or rear.
Outflanking
Moving troops around the side of an enemy formation to attack a position less protected than its front.
Outlaw
A person declared outside the protection of the law.
Ovation
A Roman victory ceremony of lower status than a full triumph.
Overlord
A superior ruler who claims authority over another ruler, including a right to demand loyalty and service.
Overproduction
Producing more goods or crops than buyers are willing or able to purchase at a profitable price.
Overstocking
Keeping more animals on an area of land than its grazing can support.
PAC
The Pan Africanist Congress, an anti-apartheid organisation that organised the anti-pass protest at Sharpeville in March 1960.
Pacemaker
An implanted electrical device that helps control an abnormal heart rhythm.
Pace of change
The speed at which change takes place.
Pacification
Bringing an area under control by ending or suppressing resistance. It does not necessarily mean that its inhabitants willingly accepted Roman rule.
Pacifism
The belief that war and violence are wrong.
Pagan
Relating to non-Christian religious beliefs or practices; Puritans used this description for customs with pre-Christian roots.
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