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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
Id Mubarak
A festival greeting meaning ‘Have a blessed Id’.
Idol
An object of worship. Belle uses it metaphorically for money because wealth has become Scrooge’s highest priority.
Idolatry
Worship of an idol rather than God. Jane uses this religious idea to describe making Rochester the centre of her existence.
Idolatry
The worship of idols or other gods instead of the one God.
Id-ul-Adha
The Muslim Festival of Sacrifice, remembering Ibrahim’s willingness to sacrifice his son in obedience to Allah.
Id-ul-Fitr
The Muslim festival of breaking the fast, marking the end of Ramadan.
Id-ul-Ghadeer
A Shi’a Muslim festival celebrating the belief that Muhammad appointed Ali as his successor at Ghadeer Khumm.
IED
An improvised explosive device: a makeshift bomb, often concealed and used to attack troops or vehicles.
IED
An improvised explosive device: a bomb assembled outside conventional military manufacturing, which may be concealed and triggered remotely.
If and only if
A statement meaning that each of two conditions implies the other, so both directions must be true.
Iftar
The evening meal that breaks the daily fast during Ramadan.
Igneous rock
Rock formed when molten rock cools and solidifies, either beneath the Earth's surface or after eruption.
Ignorance
A lack of knowledge or understanding. It can make someone dependent on other people’s explanations, but does not mean that they lack kindness or practical ability.
Ignorance
A lack of understanding of the true nature of existence, which conditions the process leading to suffering in Buddhist teaching.
IGO
An inter-governmental organisation: an organisation formed by member governments to work on shared aims. The World Bank and IMF are examples.
Ihram
The sacred state entered by pilgrims for Hajj, associated with ritual preparation, special clothing and restrictions on behaviour.
Ijma
Consensus; in Sunni legal reasoning, the agreement of qualified scholars on a religious ruling.
Ijtihad
The disciplined effort of a qualified scholar to derive a ruling from Islamic sources.
Ik Onkar
The opening expression of the Mool Mantra, meaning that there is one God.
Ilham
Divine inspiration, through which Shi’a Muslims believe Imams receive guidance; distinguished from the prophetic revelation received by Muhammad.
Illegitimacy
The historical status assigned to a child born outside marriage, which could bring social stigma and restrictions on inheritance.
Illegitimate
A person described as born outside a legally recognised marriage. Disagreement over the validity of Henry VIII’s marriage to Anne Boleyn led some people to question Elizabeth’s right to rule.
Ill health
A state of poor physical, mental and/or social well-being.
Illumination
The provision of visible light so that objects and surroundings can be seen.
Illusion
An appearance or experience that leads someone to believe something different from reality.
Illusion
An appearance that is misleading when taken to be exactly what it seems.
Image
The shape produced by a transformation.
Image
A media representation of a social group, often conveying a particular idea or stereotype about its members.
Image dimensions
The width and height of an image, measured in pixels.
Image manipulation
The alteration of an image, for example through cropping, retouching or changing its colours, which can affect its meaning.
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