circuit (n.)

late 14c., "a circumference; a periphery, a line going around (an area), whether circular or not; a circular or circuitous course," from Old French circuit (14c.) "a circuit; a journey (around something)," from Latin circuitus "a going around," from stem of circuire, circumire "go around," from circum "round" (see circum-) + ire "to go" (from PIE root *ei- "to go").

From c. 1400 as "space enclosed within certain limits." Hence, "district in which any business involving periodic journeys is done (1570s), especially of judicial assignments involving the journey of a judge from one place to another; in reference to routes followed by itinerant entertainers from 1834. Hence also circuit-rider "Methodist minister who rides a circuit, preaching successively in different stations" (by 1834); to ride circuit "take a roundabout course" is from 1650s.

Electrical sense "arrangement by which a current is kept up between two poles" is from 1746. Circuit-breaker "device for automatically opening an electrical circuit" is recorded from 1874. Related: Circuital.

circuit (v.)

"to go around," early 15c., from circuit (n.). Related: Circuited; circuiting.

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Definitions of circuit from WordNet
circuit (n.)
an electrical device that provides a path for electrical current to flow;
Synonyms: electrical circuit / electric circuit
circuit (n.)
a journey or route all the way around a particular place or area;
a ten-day coach circuit of the island
we took a quick circuit of the park
Synonyms: tour
circuit (n.)
an established itinerary of venues or events that a particular group of people travel to;
the judge makes a circuit of the courts in his district
on the lecture circuit
she's a familiar name on the club circuit
the international tennis circuit
circuit (n.)
the boundary line encompassing an area or object;
Synonyms: circumference
circuit (n.)
(law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals;
circuit (n.)
a racetrack for automobile races;
Synonyms: racing circuit
circuit (n.)
movement once around a course;
Synonyms: lap / circle
circuit (v.)
make a circuit;
They were circuiting about the state