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10 → see also Arctic Circle , dress circle , inner circle , vicious circle , virtuous circle

11 PHRASE If you say that you have come full circle or have turned full circle , you mean that after a long series of events or changes the same situation that you started with still exists. □  We've come full circle and dark-blue jeans are once again the height of style. SYNONYMS circle NOUN 1

ring:…a ring of blue smoke.

disc:Most shredding machines are based on a revolving disc with replaceable blades.

round:…small fresh rounds of goats' cheese.

cir|cuit ◆◇◇ /sɜː ^r k I t/ (circuits )

1 N‑COUNT An electrical circuit is a complete route which an electric current can flow around. □  Any attempts to cut through the cabling will break the electrical circuit.

2 → see also closed-circuit , short-circuit

3 N‑COUNT A circuit is a series of places that are visited regularly by a person or group, especially as a part of their job. □  It's a common problem, the one I'm asked about most when I'm on the lecture circuit.

4 N‑COUNT A racing circuit is a track on which cars, motorbikes, or cycles race. [mainly BRIT ]

5 N‑COUNT A circuit of a place or area is a journey all the way round it. [FORMAL ] □ [+ of ] She made a slow circuit of the room.

ci r|cuit board (circuit boards ) N‑COUNT A circuit board is the same as a printed circuit board .

ci r|cuit break|er (circuit breakers ) also circuit-breaker N‑COUNT A circuit breaker is a device which can stop the flow of electricity around a circuit by switching itself off if anything goes wrong. □  There is an internal circuit breaker to protect the instrument from overload.

cir|cui|tous /sə ^r kjuː I təs/ ADJ [usu ADJ n] A circuitous route is long and complicated rather than simple and direct. [FORMAL ] □  The cabdriver took them on a circuitous route to the police station.

cir|cuit|ry /sɜː ^r k I tri/ N‑UNCOUNT Circuitry is a system of electric circuits. □  The computer's entire circuitry was on a single board.

ci r|cuit train|ing N‑UNCOUNT Circuit training is a type of physical training in which you do a series of different exercises, each for a few minutes.

cir|cu|lar /sɜː ^r kjʊlə ^r / (circulars )

1 ADJ [usu ADJ n] Something that is circular is shaped like a circle. □  …a circular hole twelve feet wide and two feet deep. □  Using a circular motion, massage gently.

2 → see also semi-circular

3 ADJ [usu ADJ n] A circular journey or route is one in which you go to a place and return by a different route. □  Both sides of the river can be explored on this circular walk.

4 ADJ A circular argument or theory is not valid because it uses a statement to prove something which is then used to prove the statement.

5 N‑COUNT A circular is an official letter or advertisement that is sent to a large number of people at the same time. □  The proposal has been widely publicised in information circulars sent to newspapers.

ci r|cu|lar sa w (circular saws ) N‑COUNT A circular saw is a round metal disc with a sharp edge which is used for cutting wood and other materials. [BRIT ] in AM, use buzzsaw

cir|cu|late /sɜː ^r kjʊle I t/ (circulates , circulating , circulated )