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.
"to go around," early 15c., from circuit (n.). Related: Circuited; circuiting.
the apparent diurnal revolution of the sun round the earth (Ps. 19:6), and the changes of the wind (Eccl. 1:6). In Job 22:14, "in the circuit of heaven" (R.V. marg., "on the vault of heaven") means the "arch of heaven," which seems to be bent over our heads.