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cir·cuit  (s?rkt)
a. A closed, usually circular line that goes around an object or area.
b. The region enclosed by such a line. See Synonyms at circumference.
a. A path or route the complete traversal of which without local change of direction requires returning to the starting point.
b. The act of following such a path or route.
c. A journey made on such a path or route.
3. Electronics
a. A closed path followed or capable of being followed by an electric current.
b. A configuration of electrically or electromagnetically connected components or devices.
a. A regular or accustomed course from place to place; a round: a salesperson on the Detroit-Minneapolis-Chicago circuit; a popular speaker on the lecture circuit.
b. The area or district thus covered, especially a territory under the jurisdiction of a judge in which periodic court sessions are held.
a. An association of theaters in which plays, acts, or films move from theater to theater for presentation.
b. A group of nightclubs, show halls, or resorts at which entertainers appear in turn.
c. An association of teams or clubs.
d. A series of competitions held in different places.
intr. & tr.v. cir·cuit·ed, cir·cuit·ing, cir·cuits
To make a circuit or circuit of.

[Middle English, circumference, from Old French, from Latin circuitus, a going around, from past participle of circumre, to go around : circum-, circum- + re, to go; see ei- in Indo-European roots.]
simple electrical circuit system

circuit [ˈsɜːkɪt]
a.  a complete route or course, esp one that is curved or circular or that lies around an object
b.  the area enclosed within such a route
2. the act of following such a route we made three circuits of the course
3. (Electronics)
a.  a complete path through which an electric current can flow
b.  (as modifier) a circuit diagram
a.  a periodical journey around an area, as made by judges, salesmen, etc.
b.  the route traversed or places visited on such a journey
c.  the persons making such a journey
5. (Christianity / Protestantism) an administrative division of the Methodist Church comprising a number of neighbouring churches
6. (Law) English law one of six areas into which England is divided for the administration of justice
7. (Performing Arts / Theatre) a number of theatres, cinemas, etc., under one management or in which the same film is shown or in which a company of performers plays in turn
8. (General Sporting Terms) Sport
a.  a series of tournaments in which the same players regularly take part the international tennis circuit
b.  (usually preceded by the) the contestants who take part in such a series
9. (Individual Sports & Recreations / Motor Racing) Chiefly Brit a motor racing track, usually of irregular shape
to make or travel in a circuit around (something)
[from Latin circuitus a going around, from circumīre, from circum around + īre to go]
circuital  adj

circuit  (s?rkt)
1. A closed path through which an electric current flows or may flow. Circuits in which a power source is connected to two or more components (such as light bulbs, or logic gates in a computer circuit), one after the other, are called series circuits. If the circuit is broken, none of the components receives a current. Circuits in which a power source is directly connected to two or more components are called parallel circuits. If a break occurs in the circuit, only the component along whose path the break occurs stops receiving a current.
2. A system of electrically connected parts or devices.
Bulbs in a simple circuit (top) and parallel circuit (bottom left) emit bright light since each is directly connected in its own circuit to a power source. Bulbs in a series circuit (bottom right) emit dim light since each consumes a portion of the batterys power coming through a single circuit.

circuit  /srkt/  n. 1 a closed path for an electrical current: electrical circuits 2 a route with regular stops: That truck driver makes a circuit of the stores in this area. circuit

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