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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
Omnipotence
Being all-powerful. Muslims believe Allah has supreme power over creation.
Omnipotent
All-powerful; able to do anything that is possible. Believers may interpret miracles as evidence of God’s power over nature.
Omnipresence
Being present everywhere; Sikhs believe God's presence extends throughout creation.
Omnipresent
Present everywhere, rather than confined to one location.
Omniscience
Knowledge of everything. The Inspector’s apparently extraordinary knowledge can suggest omniscience, although this is an interpretation of his character.
Omniscience
Being all-knowing. Muslims believe Allah knows every event, action, thought and intention.
Omniscient
All-knowing; knowing everything, including people’s thoughts and the past, present and future.
Omniscient narrator
A narrator who can describe the thoughts and feelings of different characters, not just their outward behaviour.
Omniscient third-person narrator
A narrator outside the story who refers to characters as ‘he’, ‘she’ or ‘they’ and can reveal the thoughts and feelings of different characters.
Onan
A Jewish mourner in the period between a close relative's death and the funeral, responsible for arranging the funeral and traditionally exempt from positive religious obligations. Also written as onen.
On-demand consumption
Access to media at a time chosen by the user rather than only at its scheduled broadcast time.
On-demand content
Content available when the audience chooses to access it, rather than only at its original broadcast time.
On-demand listening
Accessing media at a time chosen by the user rather than only when it is scheduled for broadcast.
On-demand service
A service that lets audiences choose when to access available programmes rather than follow a broadcast schedule.
On-demand viewing
Access to programmes at a time chosen by the viewer rather than only at their scheduled broadcast time.
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-child policy
A Chinese policy introduced in 1979 that restricted couples living in cities to one child, with possible penalties for having a second child.
One-dimensional array
A collection arranged as a single sequence, with each element accessed using one index.
One-dimensional data structure
A data structure in which one index is needed to access an individual item.
Oneg Shabbat archive
The secret archive organised by Emanuel Ringelblum and his collaborators to record Jewish life and Nazi persecution in the Warsaw ghetto.
Oneness
The Sikh belief that all existence has one divine source, providing a foundation for recognising connections between people rather than treating them as wholly separate.
Oneness of God
The belief that there is only one God, not several gods.
Oneness of humanity
The Sikh belief that all human beings belong to one human family, created by the same God and sharing equal worth.
One-off production
The manufacture of a single product, often designed to meet an individual customer’s requirements.
One-one function
A function in which different inputs always give different outputs, so each output comes from exactly one input.
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.
One-party state
A system in which one political party holds governing power and genuine competition to replace it is not permitted.
One ratio part
One equal unit represented by 1 in a ratio; its value depends on the quantities being compared.
One repetition maximum
The greatest weight a performer can lift for one complete repetition of a particular exercise.
One rep max
The greatest load a person can lift once with correct technique in a specified exercise.
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