"a movement in a circle," 1620s, from French circuite, from Medieval Latin circuitus (see circuitous) on model of gratuite, etc.
Entries linking to circuity
circuitous adj.
"going round in a circuit, indirect," 1660s, from Medieval Latin circuitus "full of roundabout ways," from Latin circuitus "a going round" (see circuit (n.)). Related: Circuitously; circuitousness.