A closed path that electricity or another substance flows through, or a regular route that someone travels.
From Old French 'circuit' (a going around), derived from Latin 'circuitus' meaning 'a going around,' from 'circuire' (to go around), combining 'circa' (around) and 'ire' (to go).
The word's Latin root literally means 'going around,' which is exactly what electricity does in a circuit—it goes around and around in a loop, returning to where it started. This same root gives us words like 'circus' (animals going around in a ring) and 'circulate' (things moving around).
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