circuit
UK: ˈsɜː.kɪt | US: ˈsɝː.kɪt
n. 1. A closed path through which an electric current flows.
n. 2. A circular journey or route that returns to the starting point.
n. 3. A series of events or locations visited in a regular sequence (e.g., a sports circuit).
The word "circuit" traces back to Latin circuitus (a going around), combining circum (around) and ire (to go). It originally described the act of moving in a circular path, later extending to electrical pathways (18th century) and structured routes (e.g., judicial circuits). The morphemes reflect the core idea of cyclical movement.
The electrical circuit overloaded and caused a blackout.
She completed a circuit of the park during her morning run.
The band toured the national concert circuit last year.
Judges in the 19th century traveled judicial circuits to hear cases.
Engineers designed a printed circuit board for the device.