circuit
n.
late 14c., "a going around; a line going around," 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" (see ion). Electrical sense is from 1746. Of judicial assignments, from 1570s; of venues for itinerant entertainers, from 1834. Circuit breaker is recorded from 1874. Related: Circuital.
v.
"to go around," early 15c., from circuit, n.. Related: Circuited; circuiting.
〔李〕[circ;-u-;it] n.环行； 周线； 电路 ←circ ( L circus)=ring 圆，环
〔蒋〕[circ圆，环，-u，it行] 环行，周线，电路，回路
〔蒋〕[cire圆，环，-u-，-it行] 环行，周线，电路，回路
〔李〕[circu=ring圆环；it=to go→“going along a ring沿圆环走”→] n.① round about movement环行