circuit

n. 1 line or course enclosing an area; the distance round. 2 a path of an electric current. B apparatus through which a current passes. 3 a judge's itinerary through a district to hold courts. B such a district. C lawyers following a circuit. 4 chain of theatres, cinemas, etc. Under a single management. 5 motor-racing track. 6 itinerary or specific sphere of operation (election circuit; cabaret circuit). 7 sequence of sporting events or athletic exercises. [latin: related to *circum-, eo it- go]

n. The act of moving or revolving around, or as in a circle or orbit; a revolution; as, the periodical circuit of the earth round the sun.