Key terms & definitions

A boundary between two materials at which a wave may be reflected, transmitted or absorbed.

The boundary where two different materials meet.

A connection or supporting circuit that enables devices to exchange signals or work together.

An additional material applied to fabric to give it greater stiffness, support and stability.

Contact and cooperation between people belonging to different religions.

Discussion and cooperation between people from different religions to increase understanding and address shared concerns.

A marriage between people of different religious faiths.

A marriage between people belonging to different religions.

Communication and cooperation between followers of different religions.

Unwanted signals that disrupt communication.

Forgetting that occurs when one memory competes with or disrupts the retrieval of another memory.

Between generations, for example a relationship between grandparents and grandchildren.

Conflict between people from different generations, often arising from different experiences, expectations or values.

Movement in social position identified by comparing a person's position with that of their parents.

Relationships between different generations, such as parents and their adult children.

A warmer interval between glacial periods when ice sheets and glaciers retreat.

An agreement between national governments to cooperate, for example by reducing trade barriers or addressing debt.

A temporary arrangement intended to operate while a longer-term settlement is negotiated.

A temporary administration that governs until more permanent political arrangements can be established.

An angle formed between two sides at a vertex, measured inside a polygon.

Ridges of land projecting alternately from opposite sides of a narrow river valley, around which the river winds.

A trader operating without authorisation in an area where a company claimed exclusive trading rights.

A person who acts between two parties, arranging communication or business. Whymper connects Napoleon with the human world.

A business between a producer and the final customer that helps distribute or sell a product, such as a wholesaler or retailer.

The occupational class comprising clerical or sales workers, the self-employed, lower-grade technicians and foremen in Halsey, Heath and Ridge's study.

Making paper or card prototypes during design development to explore and refine a design before producing the final product.

The output of a gate within a circuit before the circuit’s final output is reached.

The output of a gate within a circuit, calculated before the final output and often recorded in its own truth-table column.

The output of one gate that becomes an input to another gate within a logic circuit.

Equipment and techniques suited to local needs, resources, skills and ability to maintain them.